pmacs/docs/active-work.md

# Active work — cross-machine resume ledger

**Snapshot: 2026-08-01.** This file records volatile work that has not
landed on `main`. Read it after `docs/agent-handoff.md`. Remove completed
entries when their PR merges; do not let this become a second permanent
backlog.

**Updated later the same day, on a new machine.** Development moved to
the laptop; the recovery path in "Repository authority" below was
exercised from this checkout and the `githubsucks` alias was absent and
had to be added, exactly as that section anticipates. **One lane opened:
CI CRDT coverage**, which had been sitting under "NEEDS A LANE" with no
branch and no owner since #166. It is implemented on
`ci-crdt-coverage` and its block replaces the old one below.

**Updated 2026-08-05.** One lane opened: **macOS CI signal integrity**
(#215, in review), which this file required a lane for and did not have
until review caught it — the #171 defect recurring. Its block is below.

**Updated later the same day.** #215 **merged** (`main` @ `12f2970`) and
that lane is **rewritten, not removed** — rule 4 removes a lane when its
ARC is done, and Stage 2 is the arc. Stage 2 (**hardening**) ran on
`ci-signal-hardening`, with its own lane block, its own checkpoint
table, and a lane written **before** the PR was opened rather than
after review asked for it. **It merged as #216 on 2026-08-05**, which
completes the arc: R2 and R4 are retired with discriminating
witnesses.

**The lane is kept, not yet removed, and that is a deferral rather than
a judgement.** Rule 4 would remove it now — but its residue must be
re-homed first, or removing it loses the state: **R1** is referred to
the async-runtime lane (Q#MCI3) and **R3** is an unresolved possible
product defect owned by the process-signal / PTY lane, neither of which
has a block here yet. Retiring this arc and opening those two is an
**absorption pass**, and doing it inside an unrelated feature PR is how
a ledger acquires edits nobody reviewed.

**Updated 2026-08-04.** Four PRs landed since: the CI CRDT coverage
lane #209, Distribution Stage 1 #211 (released as **v1.1.0**), the
post-release accuracy pass #212, and **bottom-panel Stage 3 #213 —
which completes Arc 7**. Its lane is **removed** per rule 4: the arc is
done *and* its durable facts are in `docs/agent-handoff.md` §1. The
distribution and CI-CRDT lanes are rewritten rather than removed,
because each keeps named follow-ons.

**This snapshot is an absorption pass, taken with ZERO open PRs** —
the one window in which a ledger refresh has nothing to re-conflict
with, and taken deliberately before a machine move. Nine PRs landed
since the previous anchor (#199–#207). Two arcs completed and their
lanes are **removed**, their durable facts now in
`docs/agent-handoff.md` §1: **Journey Stage 1** (1a plus the whole 1b
split) and **test ambient-root isolation**. Discovery and reap-ledger
merged a stage each and keep lanes rewritten to what remains.
`docs/agent-handoff.md` §1a now carries the whole board — every arc,
open lane, deferred item and standing hazard in one view.

*(Earlier note, retained because its reasoning still governs:)*
**This snapshot is an absorption pass.** Eight PRs merged on 2026-07-29
and 2026-07-30 (#188, #190, #191, #194, #195, #196, #197, #198) and the
ledger had drifted to 1,854 lines carrying six lanes whose work was
already on `main`. Those six are removed and their load-bearing
decisions are in `docs/agent-handoff.md` §1 — rule 4's precondition,
satisfied rather than deferred. The file is now 609 lines.

**A lane is removed when its ARC is done, not when a PR merges.** Two
lanes survive their sub-stage merges and are rewritten to the remaining
plan rather than deleted: generated-buffer immutability (Stage 1 merged,
Stage 2 not started) and bottom-panel (Stage 2 complete, Stage 3 ahead).
The bottom-panel block said so in its own text — *"this lane is not
removed at 2B-3's merge"* — and a wholesale removal keyed on "the PR
merged" would have discarded live planning. Read each block before
cutting it.

**#188's lane arrived with #188**, which is the point: with several PRs
open, a lane written on `main` for work that lands elsewhere
re-conflicts on every merge. Written on its own branch it costs one
conflict, at the merge that would have happened anyway.

The PTY terminate
diagnostic (#176) was the last lane retained past its merge — retained
because rule 4 removes a
merged lane only *after* its durable facts reach
`docs/agent-handoff.md`, and that absorption was unowned. The
2026-07-28 snapshot
owned it: #176's facts are now in the handoff (§1's arc bullet and §5's
two ops lessons about ticking observers and proving child exit), so its
lane is gone. The Lean 4, GPU-terminal-input, inline-math (#172), dired
(#169), and terminal config + copy mode lanes were removed the same way
— the last of these was #180's work, folded into #182 so two open PRs
would stop re-conflicting in this file.

**Trust the canonical-base line below over any lane header**: if a PR
number appears in `git log --first-parent githubsucks/main`, it has
landed regardless of what a lane says.

**Two open PRs had no lane here at all before the 2026-07-28
snapshot** — #174 and #171. An open PR is exactly the volatile work this
file exists to record, so its absence is a ledger defect rather than a
tidy omission: #171 drifted **153 commits** while invisible here, and
its still-green old CI run described a tree nobody had looked at since.
**When a PR is opened, give it a lane.** All three have since merged —
#174, #171 and #186 — so per rule 4 their lanes are gone again and
their durable facts are in `docs/agent-handoff.md` (§5 for #174's
lesson, §1 for the two framings).

## Repository authority

- Canonical development URL:
  `https://github.com/levineuwirth/pmacs.git`. This ledger uses the
  normalized local alias `githubsucks` so its refs and recovery commands
  are identical on every machine. Remote names are otherwise
  machine-local: `origin` may name this canonical URL, a release mirror,
  or something else, and therefore has no authority by name alone.
- Canonical base at this snapshot: **`githubsucks/main` @ `9a26ac8`** —
  GPU horizontal scroll **#223**, which **closes the QoL arc**, atop
  `2b56d16` TUI horizontal scroll **#222**, `02f3ec3` `ui.line-wrap`
  **#221** (protocol v22), `218d2e7` GUI zoom **#220** and `da56bec`
  `full_grid` **#219**. Beneath those, `db1bbe9`:
  the tree primitive **#217**, atop `2657568` the macOS CI
  signal-integrity **Stage 2 #216** (which retired R2 and R4), atop
  `12f2970` its Stage 1 registry **#215**, atop `f186253`:
  bottom-panel Stage 3 **#213**, which completes Arc 7, atop the
  post-release accuracy pass **#212**, Distribution Stage 1 **#211**
  (released as **v1.1.0**, the first release with prebuilt binaries),
  and the CI CRDT coverage lane **#209**. Beneath those, `cfc1710`:
  discovery Stage 1 #207, the ambient-root isolation implementation
  #206, Journey Stage 1b-3 #205, 1b-2 #204 and 1b-1 #203, the
  reap-ledger diagnostic #202, the isolation framing #201, the
  process-signal diagnostic #200 and the ledger absorption #199.
  **Protocol schema support is `v6..=v22`; the production server-first
  `Hello` still advertises v20** — two different facts, and #184 landed
  only the first. The upper bound moved to **v22 at #221**, which added
  `InstanceMessage::LineWrapFacts`; `ADVERTISED_PROTOCOL_VERSION` did
  not move and must not be edited to chase it. Verified against
  `pmacs-protocol/src/message.rs`, not carried forward: this line said
  `v6..=v21` for two merges after that stopped being true.
  **Historical `v21` statements elsewhere in this file are correct
  where they describe a stage as it landed** — only this
  current-state paragraph tracks the live range.
  **The recovery floor advances with the base**, so the check below
  now requires `9a26ac8` or newer; a tree at `db1bbe9` no longer
  passes — it would lack the entire QoL arc, which this file and the
  handoff both describe as complete. That is deliberate — a check accepting an older commit than
  the declared base passes on a tree the rest of this file does not
  describe.
  **Lanes below that name an older base have not been re-based; derive
  their integration surface from `git diff <their base>..main`.**
- On the transfer source, `origin/main` named a release mirror at
  `d3fa632` and lagged badly. On the current destination, `origin` names
  the canonical URL. This difference is why all recovery begins by
  verifying URLs and normalizing `githubsucks` rather than trusting
  `origin/main`.
- The shared desktop checkout contained unrelated uncommitted work. The
  branches below were prepared in isolated worktrees; never clean or
  overwrite the shared checkout to recover them.

Start on another machine by inspecting its remotes:

```sh
git remote -v
git remote get-url githubsucks
```

If the second command says the alias is absent, add it; if it prints a
different URL, stop and resolve that collision rather than overwriting an
unknown remote:

```sh
git remote add githubsucks https://github.com/levineuwirth/pmacs.git
```

Then recover current refs:

```sh
git fetch githubsucks --prune
git log -1 --oneline githubsucks/main
git worktree list
git status --short --branch
```

The `git log` command must expose `9a26ac8` — the base named above — or a
newer intentional main. Keep this threshold and the canonical-base line in
step: a recovery check that accepts an older commit than the base it
declares canonical will pass on a tree the rest of this file does not
describe.
If it does not, stop and repair the remote/fetch configuration.

**This path was exercised, not asserted, at this snapshot** — re-run
from an empty directory on 2026-08-08 when the base advanced to
`9a26ac8`, rather than having its SHA swapped. That distinction is the
whole point of this paragraph: advancing the base is exactly when the
recovery commands are most likely to have rotted, and a swapped SHA
reads identically to a verified one. `git clone` the canonical URL, add
the `githubsucks` alias, `git fetch githubsucks --prune`, confirm
`9a26ac8` is an ancestor of `githubsucks/main`, and recover with the
three-argument `git worktree add <path> -b <local> githubsucks/<branch>`
form. All four steps ran clean.

**Correction, found by re-running it.** This file claimed the
two-argument form fails for a remote-only branch with `fatal: invalid
reference`. **It does not fail.** On git 2.55.0 it *succeeds* and
leaves a **detached HEAD** — no branch, no upstream, `git status`
reporting `## HEAD (no branch)`.

Still use `-b`, but for the opposite reason to the one recorded: the
danger is not an error that stops you, it is that nothing stops you.
Work committed in that worktree sits on no branch, is not pushed by a
bare `git push`, and is exactly the "uncommitted work does not travel"
hazard in a shape that looks committed. **A documented error message
that never appears is worse than no documentation**, because the reader
waits for a signal that is not coming.

## `scripts/gate` — PR #225 OPEN (build tooling)

**PR #225** — https://github.com/levineuwirth/pmacs/pull/225. Written
**after** the PR existed, again, and again because review asked. Two
lanes in a row have now been added late; the correction from #171 and
#215 is not sticking, and recording that is more useful than a
back-dated block that pretends it did.

- **Branch `gate-script`**, base `githubsucks/main` @ `b833b13` (the
  #224 merge). **`githubsucks/gate-script` is the authoritative tip** —
  the ref, not a SHA. Recover with
  `git fetch githubsucks && git checkout gate-script`.
- **Framing `docs/gate-script-framing.md`**, approved at revision 4
  after four review rounds; revision 5 records two safety defects found
  against the implementation, not the design.
- **Scope:** `scripts/gate` (per-worktree `CARGO_TARGET_DIR`, five
  ambient roots, durable per-gate logs, the fixed gate suite),
  `tests/gate_script_acceptance.rs`, and a handoff §3 rewrite pointing
  at the script while §3 keeps policy and acceptance-suite selection.
  No `src/`, no crate, no manifest, no protocol.
- **Verification:** 15 acceptance tests over the no-gates paths, each
  isolated by `PMACS_GATE_TARGET_ROOT`. Mutation-tested; the two prune
  guards are redundant by design and only fail the test when **both**
  are removed, which is recorded in the test itself. Observed real runs
  confirm failed-gate naming, log paths, ambient creation and reaping,
  and distinct log directories per run.

**GATE STATUS — R8 RESOLVED.** This lane was blocked because
`scripts/gate` exited 1 on a clean tree: **R8** failed `m4_acceptance`
and therefore the sweep. That was never a footnote — #225 is the lane
that makes the gate suite authoritative, and a tool shipping with its
own gate red teaches the opposite of what it exists to teach.

**R8 was fixed and retired in #226** (`dcb852e`), which bounded the LSP
fixture's project detection. This branch is rebased onto it.

**RE-GATED 2026-08-09: `scripts/gate` exits 0.** All nine gates green in
one command — fmt, clippy, `--lib`, `--lib --features crdt`, both named
acceptance suites, `m4_acceptance`, `-p pmacs-gpu`, and the full
workspace sweep. That is #225's own acceptance criterion, and it is the
first time the tool has passed the suite it exists to run.

**Rebase resolution, per the standing rule that #226's R8 documentation
wins.** Three conflicts, all in R8 text this branch had written while
the row was still an open investigation: two in
`docs/ci-red-signatures.md` (both resolved to #226's retired row, this
branch's pre-fix copy dropped), and the framing-doc pair
(`e71e1bd` added it, `7cfba73` removed it — both **skipped**, since they
are net-zero here and `main` owns the file authoritatively; replaying
the second would have deleted `main`'s copy). Two now-stale lanes were
also removed: this branch's "R8 NEEDS A LANE" investigation block, and
#226's own lane, which Rule 4 retires now that it has merged — its
durable facts are in the retired registry row and the handoff §6
census.

## Destination capture (Q#JR14 generalization) — revision 8 OPEN; the shipped code implements the REJECTED revision 7

**DO NOT PREPARE A PR, AND DO NOT READ THE SHIPPED DESIGN AS CORRECT.**
The mechanism landed at `0efc8c0`; review found a correctness blocker;
`ca72461` implements **revision 7**, which review then **also
rejected**. Framing **revision 8** is the current design and is **not
implemented**.

**The original blocker:** the panel profile skipped checks 2–4 on the
claim that a panel result never touches a document window. **Panel
placement falls back to an ordinary document window** when the frontend
is not panel-capable or its side slot is dedicated, so a `"panel"`
commit could replace a **newer** document with every stale-intent guard
skipped. Reproduced in review.

**Three designs, two rejected — the sequence is the part worth not
re-learning:**

1. **Revision 6 — predict at preflight.** Rejected: the `await` refusal
   stops concurrent interleaving, not the body, which is arbitrary
   synchronous Lua and can create the fallback itself.
2. **Revision 7 — enforce at the placement boundary.** Implemented at
   `ca72461`, then rejected: `docs/agent-handoff.md:748` requires
   `commit_to` to preflight **before** the callback, because
   "validating at display time is four mutations too late". A body has
   already created buffers, handles and paint by then, so a
   placement-time refusal is a partial commit with an error return.
3. **Revision 8 — keep the preflight, REFUSE the scope-invalidating
   mutation.** Current design. Same shape as `Handle:await` being
   refused inside a commit scope: the fallback never comes into
   existence, and refusal stays mutation-free on `(false, reason)`.

**The enumeration is the load-bearing part, and it is NOT complete.**
Dedication is reachable by at least two routes — `set_params`, and
`display(buf, { side = …, dedicated = true })`, which writes
`request.dedicated` into the side window (`src/editor_core.rs:4535`).
The second was found in review *after* the first was specified, which
is the evidence that guarding one named call site is not a design.
**Every discovered route must be recorded here and carry its own
acceptance row.**

**Also closed:** an invalid-UTF-8 profile (`string.char(255)`) reached
`to_str()` and surfaced mlua's generic conversion error instead of the
documented message naming the accepted values — the same reachability
class as revision 5's `Option<String>` defect, one layer down. The
comparison is on bytes now.

**Written with the lane's first commit**, per the standing correction
from #171 and #215.

**Branch `destination-capture`**, base `githubsucks/main` @ `4bc55e8`
(the #225 merge). **`githubsucks/destination-capture` is the
authoritative tip** — the ref, not a SHA. Recover with
`git fetch githubsucks && git checkout destination-capture`.

- **Framing `docs/destination-capture-framing.md`, revision 7.**
  Revisions 1–5 were approved over four review rounds; revisions 6 and 7
  are corrections carrying the blocker above, and **revision 7's design
  is what the tree implements** — revision 6's preflight prediction is
  NOT the shipped mechanism and must not be restored from that document.
- **Implemented in three commits.** `779bb02` is the mechanism
  (`pmacs.window.capture_destination()`, the `ViewDestination` rename,
  the profile argument); `d5a6170` is
  `tests/destination_capture_acceptance.rs`; the revision-7 commit is
  the panel-profile correction plus the invalid-UTF-8 hole. **12 pins**,
  and both preservation suites pass **unchanged** (journey 47, dired 31)
  — §7's stop signal not firing rather than being suppressed.
- **HOW THE PANEL PROFILE IS ENFORCED, so revision 6's version does not
  get reinstated by someone reading only that document.**
  - `EditorCore::display_buffer` refuses **between** `resolve_placement`
    and `apply_placement` when a side request resolved to
    `PlacementKind::Ordinary` under an active `"panel"` contract whose
    destination fails the document preconditions
    (`fallback_commit_refusal`). Refusing there means a refused fallback
    mutates nothing.
  - The contract (`CommitContract { destination, profile }`) rides on
    the core, installed and restored by the **same** `ScopedFrontendGuard`
    that scopes the frontend, so a `"panel"` profile can never outlive
    the body that declared it. The field is private to the crate — Lua
    cannot claim a profile for a placement it did not commit to.
  - **The preflight predicate survives as an EARLY REFUSAL, not as the
    guarantee.** `panel_placement_can_fall_back` still gates the
    relaxation in `commit_destination_refusal`, so the statically
    knowable case — a frontend that cannot render a panel at all, and
    will not acquire the capability mid-body — refuses *before* the body
    allocates a buffer, registers a handle and paints. That is the same
    reason `commit_to` preflights at all. Both layers are pinned
    separately and neither test subsumes the other.
  - The four document checks live once, in
    `EditorCore::document_destination_refusal`, because they are now
    evaluated from two sites and two hand-written copies is how a
    backstop ends up weaker than the thing it backs.
  - **Three deliberate limits**, each a different decision rather than a
    stricter version of this one: the **document profile is untouched**
    (re-running its checks at placement would newly refuse dired's own
    documented panel path — a preservation-suite stop signal); only a
    **fallback** is guarded, not every `Ordinary` placement (a `"panel"`
    body calling `display_file` is pinned as succeeding by
    `a_captured_destination_survives_a_frontend_switch`); and the
    refusal is of the **placement**, not of falling back — a `"panel"`
    commit with an intact destination still degrades gracefully into the
    document window.
- **Audit: nothing else relied on "a panel never touches a document".**
  Four doc sites repeated the claim (`ViewDestination`'s own doc twice,
  `capture_view_destination`, `ViewDestinationLua`) and were corrected;
  no other code depended on it. Dired — the only Lua `commit_to`
  consumer — takes the **two-argument document profile**, so all four
  checks already applied to it, and it separately documents and accepts
  the side-slot fallback (`builtin/runtime/dired.lua`).
  `compile.lua`'s `already_in_panel` queries live state rather than
  assuming, and the terminal adopter's rollback keys off
  `DisplayOutcome::created_side`, already false on a fallback.
- **TWO FRAMING CLAIMS THE TREE DID NOT MATCH.** Neither changed a
  decision; both are recorded because the framing says "counted, not
  estimated" and a reader will check.
  1. **The rename was 11 references across 5 files, not 8 across 4.**
     `src/daemon.rs:1804` also calls the capture (the attaching
     frontend's directory open), and `editor.rs` holds six references
     rather than the counted total. Mechanical either way.
  2. **Q#DC-4's "a frontend with no document window" is a DEFENSIVE
     branch, not a routine one.** The obvious spelling — a frontend
     showing only a bottom panel — is asserted impossible: Q#BP6 says a
     layout always retains at least one non-side window, and
     `EditorCore::non_side_target` carries a `debug_assert!` that fires
     under `cargo test` when one does. So with Q#BP6 held a *registered*
     frontend always has a live document window. The decision still
     stands (capture stays total; an adopter with nowhere to land gets a
     refusal naming that rather than permission to fall back to ambient
     state), and the two Q#DC-4 pins drive the reachable spelling of the
     same condition — a layout whose document window has gone while the
     view remains. **#227 should not expect to hit this refusal**; it is
     insurance, not a path.
- **Mutation-tested, since a matrix of deliberate omissions is exactly
  what passes vacuously.** Retyping the profile to `Option<String>`
  fails the table and boolean rows with mlua's conversion error (the
  number row survives — Lua coerces it — which is why the closed set is
  witnessed by more than one non-string). Applying all four checks in
  both profiles fails the panel column; applying only check 1 in both
  fails the document column. Defaulting an omitted profile to `"panel"`
  fails **`journey_acceptance`'s two preservation pins**, which is the
  contract claim being executable rather than asserted. Dropping the
  frontend scope for the panel profile fails the survives-a-switch pin's
  panel row; dropping the no-document-window arm fails the Q#DC-4 pair.

  **Revision 7's four, each isolating a different way to get it wrong** —
  and the pattern of *which* rows survive each is the evidence the layers
  are independent rather than redundant:
  1. delete the `fallback_commit_refusal` call from `display_buffer` →
     **only** the inside-the-body pin fails. Every other test passes,
     which is exactly the hole revision 6 would have shipped.
  2. delete the `panel_placement_can_fall_back` arm from
     `commit_destination_refusal` → **only** the two pre-established
     fallback rows fail, and they fail on shape (a raise from the
     backstop, with the body having run) rather than on outcome.
  3. make `panel_placement_can_fall_back` unconditionally `true` (the
     "widen the predicate" non-fix) → the really-lands-in-the-panel pin,
     the Q#DC-4 panel pin and the matrix's three panel rows all fail.
     That is the profiles collapsing into one, made visible.
  4. make `fallback_commit_refusal` refuse *every* panel fallback → only
     the graceful-degradation pin fails, which is the guard
     over-reaching.

  And reverting the byte comparison to `to_str()?` fails the
  `invalid utf-8` row with mlua's conversion error, on content.
- **The public API #227 adopts against (Q#DC-5), pinned so it is a
  contract rather than an intention:**
  `pmacs.window.commit_to(dest, body [, profile])`. Profile is an
  optional trailing argument typed **`mlua::Value`, not
  `Option<String>`** — with `Option<String>` mlua rejects a number or
  table during argument *conversion*, before the closure runs, making
  the promised "accepted values are…" message unreachable. That is the
  same trap the existing binding documents for `dest`. Validated in the
  body against a **closed** set — `"document"` and
  `"panel"`. **Omitted means `"document"`**, so every existing
  two-argument caller keeps all four preflight checks *by definition of
  the signature*, which is what makes `journey_acceptance` passing
  untouched a consequence rather than a hope. An unrecognized or
  non-string profile **errors**, naming the accepted values — a silent
  fallback would hand a caller different checks than it asked for,
  which is the exact failure the parameterization exists to prevent.
  Git's mapping is settled here too: `*git-status*` → panel,
  `*git-diff*` → document. Revision 2 took three findings: Q#DC-2's parameterization was
  incomplete (a panel depends on **none** of checks 2–4, not just check
  3, so the question now carries a full preflight matrix with every
  omission testable); `tests/journey_acceptance.rs` joins dired as a
  **preservation suite and stop signal**, since it holds the
  `commit_to` scope, forged-userdata, preflight and restoration pins
  this lane generalizes; and the **coherence-impact section was missing
  entirely**, which `CLAUDE.md` and `COHERENCE.md` §25 both require.
- **A PREREQUISITE LANE. PR #227 (git Stage 1) blocks on it.** #227's
  P1a review finding is why it exists: git's async completions mutate
  and display UI without capturing the initiating frontend
  (`builtin/runtime/git.lua:609`, `:854`), so a result surfaces in
  whichever frontend is active when git exits.
- **The mechanism existed but was not Lua-reachable** until `779bb02`.
  `pmacs.window.commit_to` took a `DirectoryDestinationLua`, which is
  **nonconstructible from Lua** by design
  (`src/lua_bindings/mod.rs:4256`) and minted only inside the
  `path.open-directory` listener dispatch (`src/editor.rs:1311`) from a
  `pub(crate)` capture (`:1241`). So no async Lua continuation outside
  a directory open could say where its result belongs. Line numbers are
  the pre-lane ones, kept because they are what the finding was written
  against.
- **Scope:** a Lua-reachable capture, a generic rename
  (`DirectoryDestination` → `ViewDestination`; the framing counted 8
  references across 4 files, the tree held **11 across 5** — see the
  finding above), and the preflight question below.
  **No adopter**: git's adoption is #227's work after this lands, since
  a prerequisite that converts its own first consumer cannot be
  reviewed separately from it.
- **The substantive question (Q#DC-2)** is that git's two continuations
  differ in kind. `*git-status*` goes to the **bottom panel**
  (`listview.open` defaults `display` to `"panel"`,
  `builtin/runtime/listview.lua:550`); `*git-diff*` replaces a
  **document** window. `commit_to`'s stale-intent check (Q#JR14c) is
  right for the second and, *when the placement really is a panel*,
  irrelevant to the first. One shape over-refuses the panel or
  under-checks the document.

  **DO NOT READ THE OLDER FORM OF THIS BULLET, WHICH SAID "the panel
  never touches the captured window's buffer".** That is the claim
  revisions 6–8 invalidate: panel placement **falls back** to an
  ordinary document window when the frontend is not panel-capable or
  its side slot is dedicated. The relaxation is conditional, and the
  mutations that could make it fall back are refused inside a
  panel-profile commit (revision 8) rather than predicted at preflight
  (revision 6) or caught at placement (revision 7, which would refuse
  after the callback had already mutated).
- **Stop signal recorded in the framing:** if any existing dired test
  needs editing, the generalization changed Journey Stage 1a's
  semantics, and that is cause to stop rather than to adjust the test.
- **Gates, as the executable line rather than a description:**

  ```
  scripts/gate --acceptance destination_capture_acceptance \
               --acceptance journey_acceptance \
               --acceptance dired_acceptance
  ```

  `--acceptance` is repeatable, so there is no reason for this ledger
  to say "plus dired's" and leave the reader to reconstruct it.
  **`journey_acceptance` and `dired_acceptance` are preservation suites
  and a STOP SIGNAL**: they carry the `commit_to` scope,
  forged-userdata, preflight and restoration pins this lane
  generalizes, and if either needs editing, the change altered Journey
  Stage 1a's semantics rather than closing a gap in them. No
  `--protocol` — core and Lua bindings only.

## LSP LaTeX coverage — IMPLEMENTED, gates green, no PR yet

**Written with the lane's first commit**, per the standing correction
from #171 and #215.

**Branch `lsp-latex-coverage`**, base `githubsucks/main` @ `4bc55e8`
(the #225 merge). **`githubsucks/lsp-latex-coverage` is the
authoritative tip** — the ref, not a SHA. Recover with
`git fetch githubsucks && git checkout lsp-latex-coverage`.

- **Framing `docs/lsp-language-coverage-framing.md`, revision 3 —
  IMPLEMENTATION AUTHORIZED 2026-08-09**, after a summary of its four
  corrections rather than a findings round on the document itself.
  Recorded that way deliberately: the §3 `.texlabroot` verification
  caveat was live and binding, and was step zero of the work rather
  than a footnote it could be read past. **It is now discharged — see
  below.** **Revision 1 was UNTRACKED on `main` in one checkout** and
  therefore did not travel; committing it here is the fix.
- **Scope: one `pmacs.lsp.config.latex` entry plus its root resolver.**
  `texlab` 5.25.1 is installed and unused; a `.tex` buffer highlights
  correctly and offers no completion, diagnostics, or go-to-definition.
- **Revision 2 found Slice 1 is SMALLER than revision 1 framed.** The
  proposed `.tex`/`.latex`/`.sty`/`.cls` filetype mappings are
  redundant: the grammar already carries exactly those extensions
  (`src/syntax.rs:1111`), grammar-extension detection sits **ahead** of
  the LSP filetype map in the precedence chain
  (`docs/latex-grammar-math-substrate-framing.md:166-171`), and
  `lsp.lua:267-270` calls that map "mainly the LSP-only fallback". The
  two systems cannot disagree, because the grammar's extension list is
  what drives detection.
- **Two other corrections.** `haskell-language-server` **is** installed
  on this machine — revision 1 said it was not, which was the whole
  basis of its Slice 1 / Slice 2 split. And Q#LX3's deferral argument
  read `COHERENCE.md:1669` ("first slice in flight") when `:124` and
  `:867` both record multi-root affinity as **merged (#161)**; that
  line contradicts the same document twice and wants a separate fix.
- **Q#LX2 (the LaTeX root) is answered.** An upward marker walk through
  `config.latex.root`, which already accepts a resolver function
  (`lsp.lua:543`), falling back to the file's own directory.
  **`.git` is deliberately excluded**: a repo root is the wrong answer
  for LaTeX, and it is the one place copying the other fourteen
  entries' instinct is actively wrong.
- **STEP ZERO IS DISCHARGED — §3's `.texlabroot` caveat, by
  observation.** Marker 1 **ships**, and the framing's premise for it
  was corrected in the process.
  - **`.texlabroot` is a real texlab marker.** texlab v5.25.1's
    `crates/distro/src/language.rs` maps `.texlabroot`/`texlabroot` →
    Root, `Tectonic.toml` → Tectonic, `.latexmkrc`/`latexmkrc` →
    Latexmkrc; `ProjectRoot::walk_and_find`
    (`crates/base-db/src/deps/root.rs`) walks ancestors testing all
    three, innermost wins. The shipped marker set is **texlab's own**,
    including the bare `texlabroot`/`latexmkrc` spellings the framing
    did not list.
  - **But texlab cannot apply that walk to fix a root pmacs gets
    wrong**, which is the correction that matters. Each arm searches
    `workspace.iter()` — documents ALREADY LOADED — and the workspace
    comes from the folders the CLIENT supplies. Hand-driven LSP
    sessions confirmed it: with `rootUri` at a `chapters/`
    subdirectory, no marker above it (`.texlabroot` included) widened
    texlab's view and its dependency graph never reached the parent
    document; with `rootUri` at the marker directory the parent
    resolved, marker present or not. **texlab honours the root it is
    handed and never corrects a too-narrow one**, so what
    `config.latex.root` returns *is* the project scope. That makes the
    resolver the whole value of the lane rather than a nicety.
  - **`args = {}` is also observed**, not assumed: bare `texlab`
    answers `initialize` with `TexLab 5.25.1` over stdio, so the `run`
    subcommand is not needed.
  - **§3 said the wrong thing and has been corrected — `b5eaf27` IS
    revision 3.** It framed marker 1 as conditional on texlab honouring
    the `.texlabroot` *file*, when the operative fact is that texlab
    honours the *client-supplied root* and never widens it. The caveat
    was discharged by observation, and revision 3 records what that
    established. Nothing about §3 is outstanding.
- **`.git` exclusion needed more than omitting it from the list.**
  `project_root_for` falls through to `pmacs.project.detect` when a
  resolver returns nil, and **that** walk includes `.git` — so a
  resolver declining on a markerless file would hand texlab the
  repository root by the back door. The resolver therefore never
  declines for a file that has a directory. Pinned end to end through
  attach, with the same fixture asserting the shared detector really
  would have answered the repo root.
- **Commit `a9ef37f`** — `builtin/runtime/lsp.lua` plus
  `tests/lsp_latex_acceptance.rs` (14 tests, one per §6 bullet plus the
  boundary and decline cases). No `settings`/`init_options` (Q#LX1); no
  filetype mappings (§2, asserted both ways).
- **Gates: ALL GREEN** via
  `./scripts/gate --acceptance lsp_latex_acceptance` — fmt, clippy,
  lib, lib-crdt, the new suite, m4, gpu, the workspace sweep (115
  suites, zero failures), diff-check. No `--protocol` — a config entry,
  no wire.
- **Seven mutations each fail the suite**: resolver declining on no
  marker (6 tests), no marker walk (4), a redundant `filetypes.tex`
  (1), boundary ignored (1), `io.open` truthiness so a directory counts
  as a marker (1), marker set narrowed (4), command renamed with
  opinionated settings added (1).
- **The boundary has now been the interesting part twice, and the
  second time it was a real defect (fixed in review).** First it was
  hermeticity — every fixture sets `set_search_boundary` at its own
  tempdir because R8's shape (a stray `latexmkrc` above the tempdir)
  would make the markerless assertions pass while testing nothing.
  Then review found `latex_within_boundary` answering a PATH question
  with string arithmetic: `dir:sub(1, #boundary + 1) == boundary .. "/"`
  compares against `"//"` when the boundary is `/`, which no canonical
  path matches, so a root boundary judged **every** ancestor out of
  bounds, ran no marker walk at all, and gave each chapter of a thesis
  its own server — the lane's headline behaviour silently off, with
  every shipped test still green because each one clamps to a tempdir.
  The same trap sat at the other end (`/` was never a walk candidate,
  and `/paper.tex` sliced to an empty directory and declined into the
  `.git`-aware detector). Now segment comparison throughout: the root
  is a boundary with zero segments, contained by construction rather
  than by a special case. Pinned by an ATTACH-level test under a `/`
  boundary — two chapters, one server, marker root — and the
  hermeticity property asserts **both** directions, since "stops at the
  boundary" is also satisfied by a walk that never runs. Suite is 16
  tests. **A reader
  deciding whether to trust this resolver should read it as: the marker
  set and the `.git` exclusion were settled by observation and are
  solid; the boundary arithmetic around them was not, and is the place
  to look first if roots come back wrong.**
- **Trap for the next agent in this worktree:** this machine exports a
  shared `CARGO_TARGET_DIR`, so a bare `cargo test` compiles against a
  sibling worktree's artifacts and fails with errors from code that is
  not in this tree. Use `scripts/gate`, or
  `CARGO_TARGET_DIR="$(./scripts/gate --print-target-dir)"` for ad-hoc
  runs. `scripts/gate`'s own header documents this; the failure looks
  like a broken branch, which is why it is recorded here.
- **No PR opened**, by instruction.

## `scripts/gate --protocol` build step — **MERGED as #229** (`7cf4653`)

**MERGED as PR #229** — https://github.com/levineuwirth/pmacs/pull/229,
at `3b10f9d`, 14/14 CI green including both macOS legs. `main` is now
`7cf4653`. *(This lane still awaits Rule 4 retirement — its durable
facts belong in the handoff before the entry is removed. Corrected here
only because the previous text said "Held, not merged", which the merge
falsified; the retirement itself is not this lane's work.)*

**History, retained:** opened at `93d557a`. Its first CI run went red on
`Test (macos-latest / lua54)`; the rerun turned that selector green and
went red on a **different** one. Both are recorded as **U4** and **U5**
in `docs/ci-red-signatures.md`, as separate incidents per the matching
rule rather than one signature twice.

**Registry numbering conflict, expected at merge.**
`worker-identity-stage1` independently defines its own **U4** and **U5**
on its branch. This lane merges first, so on `main` the rows above are
U4/U5 and **worker identity must renumber its pair on rebase**. Flagged
here because a rebase that resolves the textual conflict without
renumbering produces two different incidents sharing an id, which is
exactly the failure the registry's matching rule exists to prevent.

**Written with the lane's first commit**, per the standing correction
from #171 and #215.

**Branch `gate-protocol-build`**, base `githubsucks/main` @ `4bc55e8`
(the #225 merge). **`githubsucks/gate-protocol-build` is the
authoritative tip** — the ref, not a SHA. Recover with
`git fetch githubsucks && git checkout gate-protocol-build`.

- **Framing `docs/gate-protocol-build-framing.md`, revision 5.** The
  fix itself is implemented and green at `49bc141`; **its regression
  witness landed separately at `677fd25`**, after review found the
  original witness did not reach the step it named. Narrow by design:
  one missing step in one script, plus the boundary question that let
  it go missing. No `src/`, no protocol, no feature work.
- **WAS THE OPEN BLOCKER — the witnesses did not reach the step they
  name. CLOSED at `677fd25`.** `--print-plan` **strips names** before
  printing, so the ordering assertion saw only commands; `--self-test`
  **hardcodes** `build-crdt` inside its own synthetic plan. Review
  demonstrated the consequence: **renaming the real build step to
  `sweep-crdt` left both tests passing.** So the lane had shipped
  without the regression guard it was created to provide. §7 requires
  **both** real emitter pairs — `build-crdt` and `sweep-crdt`, name
  *and* exact command — because the hole is symmetric and revision 4
  closed only half of it. The synthetic `--self-test` stays: it
  witnesses the *runner* (failure naming, `FAILED:` list, log paths,
  non-zero exit, and continuation via the sentinel), which is a
  different thing from attributing the real step, and it may no longer
  stand in for it. **What closed it is the "THE WITNESS DID NOT REACH
  THE STEP" bullet further down** — `--print-plan-named`, with all four
  renames and drifts mutated red.
- **The defect, as found.** `--protocol` adds the CRDT workspace sweep,
  whose documented precondition is `cargo build --workspace
  --no-default-features --features luajit,crdt` — documented in handoff
  **§5** at the time, **§3** now. The plan emitter had **no build step
  at all** — read from the source, not inferred from the failure.
- **Why it was latent, and why that makes it urgent rather than tidy.**
  Before #225 every worktree shared one `CARGO_TARGET_DIR`, which
  almost always already held a `pmacs-gpu` binary, so the precondition
  was satisfied **by accident**. Per-worktree target dirs start empty.
  The hazard is not the red gate that stops you — it is a **green**
  `--protocol` run whose crdt sweep was decided by the state of the
  build directory rather than by the diff. That is a gate reporting
  coverage it does not have, which is what #225 exists to prevent.
- **Observed on PR #228's first gate run:** twelve
  `gpu_invocation_acceptance::crdt::*` failures, all *"build pmacs-gpu
  before this acceptance suite"*, with `debug/pmacs-gpu` absent.
- **The durable half is a boundary question.** `scripts/gate`'s header
  names handoff **§3** as the owner of its reasoning, and this
  precondition lives in **§5** — a coherent cause for the omission, not
  mere oversight.

  **Resolved in framing revision 2: §3 becomes the SOLE normative home,
  §5 keeps the incident and its signature as history, and the script's
  header keeps citing §3 ALONE.** Revision 1 proposed citing both,
  which splits one executable contract across two homes and weakens the
  script's only clean boundary at the same time as Q#GR-4 declines to
  build any automated check for prose drift. This entry recorded that
  superseded decision until now; a recovering machine reading the stale
  version would have rebuilt revision 1's wrong boundary.
- **Q#GR-1 — SETTLED BY OBSERVATION, 2026-08-09, before any fix was
  written.** On a **disposable** target directory (never a live lane's),
  with `debug/pmacs-gpu` asserted **absent before each run** as a
  recorded precondition, each sweep run **alone** from that same cold
  state so neither could have built the binary for the other:

  | sweep | exit | result | `pmacs-gpu` after |
  |---|---|---|---|
  | default | **0** | green, 114 test targets | **still absent** |
  | crdt | **101** | exactly **12** failures, all `gpu_invocation_acceptance::crdt::*`, all *"build pmacs-gpu before this acceptance suite"* | still absent |

  So framing §3's inference **holds** and §4's *"only under
  `--protocol`"* is correct — the default sweep never builds the binary
  and never needs it. **Mechanism, now established rather than
  guessed:** `pmacs-gpu` has no `tests/` directory, so cargo never
  uplifts its bin to `debug/pmacs-gpu`; only an explicit `cargo build`
  produces it.

  **Found while doing it, and worse than the twelve:**
  `bottom_panel_stage2b_gpu` a54 reported **`ok`** in that cold crdt
  sweep. Its only path that does not spawn `pmacs-gpu` is its skip
  branch, so a test whose whole purpose is real wgpu rendering passed
  having rendered nothing. The missing build does not merely fail
  twelve tests — it voids coverage in tests that report green.
  (`vterm_stage3` a37 has the same shape by source read; cargo captures
  passing tests' output, so the skip is invisible in the log.)
- **What landed.** A named `build-crdt` step emitted immediately before
  `sweep-crdt` under `--protocol`, carrying the exact §5 invocation —
  **not** folded into the sweep command, because `cargo build … &&
  cargo test …` reports a *build* failure under the name `sweep-crdt`.
  Plus **`--self-test`** (Q#GR-5): a hardcoded three-line synthetic plan
  — pass, fail-named-`build-crdt`, **pass sentinel** — driven through
  the *real* runner loop, which is what makes the **runner's** failure
  naming *and* continuation observable at all. (It does **not** witness
  the real step's name — see the round-two entry below, which is where
  that gap was found and closed.) `PLAN_FILE` is deliberately **not**
  injectable: that would turn the runner's `eval` into a general command
  executor, the same defect this script's review caught in
  `--acceptance`.
- **THE WITNESS DID NOT REACH THE STEP — found in review of the
  implementation, closed at `677fd25`.** The lane shipped without the
  regression guard it was created to provide, because **neither witness
  could see a name**: `--print-plan` renders `emit_plan | cut -f2-`, so
  the ordering test compared *commands* with the names cut off, and
  `--self-test` hardcodes the string `build-crdt` in its **own
  synthetic** plan, so it proves things about the runner and nothing
  about the real emitter. Review demonstrated it directly: **renaming
  the real build step to `sweep-crdt` left both tests passing** — a plan
  that would report a build failure under the sweep's name, sitting
  green, which is the exact misattribution the separate step exists to
  prevent.

  **The fix is `--print-plan-named`**: a second *rendering* of the same
  `emit_plan`, printing the `name<TAB>command` text the runner reads
  back from `PLAN_FILE`, asserted by **whole-line equality** so name and
  command are pinned together, and `sweep-crdt`'s pair asserted too
  (asserting only the build's name leaves the identical hole open in the
  other direction). **`PLAN_FILE` remains uninjectable** — a test that
  supplied the runner's plan would turn its `eval` into a general
  command executor, the defect the `--acceptance` refusal exists to
  prevent — and **`--self-test` stays**, witnessing the *runner* (failure
  naming, `FAILED:`, log paths, non-zero exit, continuation via the
  sentinel), which it may no longer *stand in for* attribution of the
  real step. A companion test pins `--print-plan` as that rendering
  minus its names, so the two cannot drift into asserting a name the
  runner never uses. Both new tests are on the **no-gates** paths.

  **Mutated individually, each now red** (the first is the one the
  previous round passed): build renamed `build-crdt` → `sweep-crdt`;
  sweep renamed `sweep-crdt` → `crdt-sweep`; build features
  `luajit,crdt` → `luajit`; build emitted **after** the sweep. Suite is
  20 tests.
- **AUDITED FOR THE SAME DEFECT ELSEWHERE, and one instance is left
  open deliberately.** Renaming **every other** plan step — `fmt`,
  `clippy`, `lib`, `m4`, `gpu`, `sweep`, `diff-check`,
  `acceptance-<suite>` — leaves all 20 tests green: no test asserts any
  step name but `build-crdt` and `sweep-crdt`. For most that is only a
  log filename and a `FAILED:` entry. **`sweep` is not**: the runner's
  end-of-run listing globs `"$LOGDIR"/*-sweep.log` and
  `*-sweep-crdt.log`, so renaming that step silently empties the *"read
  these, do not re-run and grep"* listing that is the U2/U3 remedy, with
  the suite still green. **Not closed here**: the listing only exists on
  the *run* path, and every test in this file is deliberately no-gates,
  so there is no cheap witness for it — recorded rather than papered
  over.
- **Blocks PR #228 (discovery Stage 2).** That lane's `--protocol`
  result needs re-establishing on a fresh target dir under the repaired
  script. Deliberately **not** folded into that feature branch, and it
  happens **after** this lands, not inside it.
- **Acceptance criterion, witnessed 2026-08-09.**
  `scripts/gate --acceptance gate_script_acceptance --protocol` on a
  target root that **did not exist** (precondition recorded, not
  assumed): all eleven steps green, `09 build-crdt ok` producing
  `debug/pmacs-gpu`, and `gpu_invocation_acceptance` at **15 passed /
  0 failed** where the same suite was 3/12 without the build step.
  Zero occurrences of the *"build pmacs-gpu"* signature in the sweep
  log, and a54/a37 ran for real rather than taking their skip branches.
  **No manual build anywhere** — which is the thing that was false.
- **UNEXPLAINED RED, recorded rather than swept up.** An earlier
  attempt at the same cold run failed step 10 with **36 + 4 + 6 + 4
  failures across `m5_5`/`m5_6`/`m5_7`/`m5_8`**, all real-daemon
  suites, all with signature *"daemon exited with exit status: 101
  before socket appeared; socket=/tmp/.tmpXXXX/pmacs.sock — `<stderr
  empty>`"*. **Not** the `pmacs-gpu` signature, and no row in
  `docs/ci-red-signatures.md` matches it. Re-running the same test
  binary from the same target directory gave 36/36 green, which by
  that registry's own rule establishes **intermittence only, never
  environmental cause** — so this stays open rather than being
  attributed to the load (~25–30 across four concurrent lanes' gates).
  **De-implicated from `build-crdt` by construction, not by the green
  rerun:** the root crate's `default = ["luajit"]`, so
  `--no-default-features --features luajit,crdt` enables *exactly* the
  same feature set as the sweep's `--features crdt`. The build step
  cannot hand the sweep a differently-featured binary, so it has no
  mechanism by which to break a daemon suite. Local, not CI, so not a
  registry row; noted here for whoever sees it next.
- **Gates:** `scripts/gate --acceptance gate_script_acceptance`. Note
  the recursion — this lane edits the script that runs its own gates,
  so `--print-plan`, `--print-plan-named`, `--help` and `--self-test`
  were also checked by hand after each edit: a change that breaks the
  script cannot be reported honestly by the script. The assertions were
  **mutation tested**: wrong features, wrong position, unconditional
  emission, an aborting runner, the build folded into `sweep-crdt`, and
  — added in the second round — a **rename of either** the build or the
  sweep step each fail the suite.
||||||| parent of 72bbb96 (docs: LSP LaTeX coverage framing revision 2, on a branch at last)
||||||| parent of ac1d6cc (docs: frame a general destination capture (revision 1))

## QoL arc retirement — PR #224 OPEN (docs only)

**PR #224** — https://github.com/levineuwirth/pmacs/pull/224. Written
**after** the PR existed rather than with the lane's first commit —
which is the standing correction from #171 and #215 being missed again,
and it took review asking. Recorded that way rather than quietly
back-dated: this file requires a lane for **every open PR**, including
the PR that retires other lanes.

- **Branch `retire-long-lines-lane`**, base `githubsucks/main` @
  `9a26ac8` (the #223 merge). **`githubsucks/retire-long-lines-lane` is
  the authoritative tip** — the ref, not a SHA, since any edit to this
  block advances past whatever SHA it records. Recover with
  `git fetch githubsucks && git checkout retire-long-lines-lane`.
- **Docs only.** Two files, `docs/active-work.md` and
  `docs/agent-handoff.md`. No `src/`, no crate, no manifest, no test
  changes.
- **Scope:** Rule 4 for the QoL arc, closed at #223. Remove the three
  merged lane blocks (long lines, Stage 1 #219, Stage 2 #220) **after**
  re-homing their durable residue to the handoff; advance the handoff's
  date and `main` anchor and this file's canonical-base record and
  recovery floor; add capability-aware keymap resolution as a named
  handoff §6 backlog item — cross-cutting, **not started**, needs its
  own framing.
- **Verification:** `git diff --check` clean. **The recovery path was
  re-exercised, not SHA-swapped** — fresh clone into an empty
  directory, `githubsucks` alias, `--prune` fetch, `9a26ac8` confirmed
  an ancestor of `githubsucks/main`, worktree recovered with the
  three-argument form; all four steps clean. Swept for dangling
  references to the removed lanes and their branches. The full gate
  suite is **not** re-run for a change that cannot reach it, and that
  is stated rather than left as a gap.
- **Retire this block in the next absorption after #224 merges.** It
  describes a docs PR; once merged there is nothing volatile left.

## Docs absorption after #217 — MERGED as #218 (2026-08-06 09:59Z)

**PR #218** — https://github.com/levineuwirth/pmacs/pull/218. **This
block was written with the lane's first commit, before the PR
existed**, so the row above was filled in rather than invented. That is the standing correction from #171 (153 commits of
drift while invisible here) and #215 (no lane until review caught it):
this file requires a lane for every open PR, and the way that stops
recurring is writing it now rather than after someone asks.

- **Branch `docs-absorption-217`**, base `githubsucks/main` @ `db1bbe9`
  (the #217 merge). `githubsucks/docs-absorption-217` is the
  authoritative tip — any edit to this block advances past whatever SHA
  it records, so the ref is the thing to trust. Recover with `git fetch
  githubsucks && git checkout docs-absorption-217`.
- **Docs only.** No `src/`, no crate, no manifest, no test changes.
  Gates run are fmt, `git diff --check`, `--lib`, and
  `listview_acceptance`; the full suite is not re-run for a change that
  cannot reach it, and that is stated rather than left as a gap.
- **Scope:** retire the tree and macOS-CI arcs per rule 4, re-home
  their residue first, file R5 and R6, and carry four durable lessons
  into the handoff.

### Not in scope

Diagnosing R5 or R6, or auditing the three readiness helpers — those
are the lanes this one creates, not work it does. Retiring the
CI-CRDT, Distribution, or reap-ledger lanes: each still owns undone
work and rule 4 does not apply to them.

## Empty-content readiness, a fourth and fifth instance — FOR THE R6 AUDIT

Found 2026-08-06 while gating this lane, recorded here because it
widens an existing lane's scope rather than starting one.

A loaded `--features crdt` run failed `m6_1_pty_raw_mode_disables_kernel_echo`
and `m6_1_pty_canonical_mode_keeps_kernel_echo` with
**`stty -a output was: ""`** — read-before-write on the child's output.
That is the **same family as R4** (readiness predicate satisfied by an
empty file) and **R6** (readiness file never published), and it means
the readiness-helper audit's scope is not just three `wait_for_file`
copies under `tests/`: `src/process.rs`'s own tests carry the shape
too.

Both passed isolated and the full suite was green on a quiet machine,
so this is load-sensitive and **undiagnosed** — recorded as a scope
note for the audit, not as a registry row: these were local, and the
registry judges red **CI** runs.

## Pre-checkout CI reds — a class the registry has no row shape for

Seen 2026-08-06 on #220, three times across two runs (`M4`+`M5`, then
`M5` again on the rerun):

```
Prepare all required actions
Getting action download info
Failed to resolve action download info. Error: Internal Server Error
##[error]Failed to resolve action download info.
```

**This is not a flake and not a test failure.** The job dies inside
`Set up job`, before `actions/checkout` — a `grep` for
`checkout|cargo|test result:` over the full job log returns **0**. No
repo code is fetched, so the red carries *zero* information about the
commit, in either direction.

Two things follow, and both matter for signal integrity:

- **Re-running is a first execution, not a retry-to-green.** The rerun
  rule governs a test that ran and failed; nothing ran here. The
  discriminator is objective and cheap — did the job reach checkout?
- **It cannot be a registry row as the registry is written.** Matching
  requires an *exact test selector* plus fragments, and there is no
  test. Recorded here rather than forced into a shape it does not fit.

The second `M5` failure took **4m52s**, which read like a real run;
the duration was entirely retry backoff. Duration is not evidence that
a job executed — **the log is**.

Whether `docs/ci-red-signatures.md` should grow a short non-row section
for this class is an open question for its owner, not something this
lane decided.

## Tree primitive (P5) — MERGED as #217; adoption is the open work

**The lane is gone, not the work.** Rule 4 removes a lane after merge,
and the primitive is merged: `listview` rows take optional `depth` and
`id`, collapse is primitive-owned, selection re-seats by id, and the
LSP outline is the one adopter. `COHERENCE.md` §14 is ◐ and §20 says
adoption rather than construction, which is where the remaining work is
recorded — **not here**, because none of it is in flight.

What review found is worth carrying forward, since all four were
invisible to a passing suite:

- **A selection test that toggled the root proved nothing.** The root
  sits on line 1 before and after collapsing, so it passed unchanged
  under the line-keyed re-seating that id-keyed re-seating replaced.
  A moving-node witness (`tr_4`) was the fix.
- **TAB was bound on every listview**, so flat panels lost their
  fall-through to the global binding and the Q#P3 read-only intercept.
  Delegation restored it.
- **`item` was effectively required.** `line_to_item` is sparse when a
  row omits the optional `item`, and `seat_cursor` took `#` of it — a
  display-only tree stranded the cursor on the header. Every existing
  test supplied `item`, so none could reach it.
- **"Opaque, compared by equality" was two contracts.** Selection uses
  `==`; collapse keys a table, which consults no `__eq`. Narrowed to
  string-or-number, and with it uniqueness and not-NaN, all enforced
  where rows enter.

The last two are the durable lesson and it is in the handoff: **an
optional field that a data structure's shape depends on is not
optional**, and a contract that two mechanisms must honour is only as
strong as the weaker mechanism.

## Leaked daemons from `gpu_invocation_acceptance` — NEEDS A LANE

**Found 2026-08-05 while cleaning up after the tree-primitive work. No
branch, no framing.**

- **42 orphaned `pmacs --daemon` processes** were resident on the
  development machine, **the oldest 3 days 23 hours old**. All had been
  **reparented to systemd** (`ppid=1`) and all had **deleted sockets**,
  so nothing could ever reach or reap them.
- **Source: `tests/gpu_invocation_acceptance.rs`** — the one-command
  tests, whose daemons carry `--socket <tempdir>/one-command.sock`. The
  tempdir is cleaned up; the daemon is not.
- **Rate measured, not estimated: 3 per sweep.** A single isolated
  `--features luajit,crdt` sweep leaked exactly three. 42 is what
  several days of sweeps accumulate to.
- **This predates the tree work** — the oldest is four days old — so it
  is a standing leak, not something a current lane introduced.

**Why it belongs to the reap-ledger family.** This is precisely the
shape that lane exists for: a process that outlives its supervisor with
nothing left watching it. The ledger arms only for `spec.group`, and
these are daemons spawned by a test harness rather than by compile mode,
so **nothing in the existing ledger covers them**.

**Why it matters beyond tidiness.** Dozens of resident daemons were
present during every local sweep run this week, including the one that
produced the unclassified failure recorded in the **tree-primitive lane
above** (and, in full, in that lane's framing §6a). That
makes them a **rival explanation** to the shared-target-dir mechanism
for that occurrence, and neither can be tested against it now — the
signatures were not captured. A leak that quietly changes the
environment of every subsequent test run is a measurement problem as
well as a resource one.

**First questions for whoever takes it:** does the test harness fail to
reap, or does the daemon fail to exit when its socket disappears? Those
have different fixes, and the second would be a product defect rather
than a test one.

## macOS CI signal integrity — ARC RETIRED (#215, #216); residue re-homed

**Both stages merged and the arc is done**, so rule 4 removes the lane.
Stage 1 built `docs/ci-red-signatures.md` and audited the incumbents;
Stage 2 retired **R2** and **R4** with discriminating witnesses. The
framing `docs/macos-ci-signal-integrity-framing.md` and the registry
both survive the lane — the registry is the durable artifact this arc
existed to produce.

**Retiring it required re-homing the residue first**, which is why this
did not happen at merge. A lane removed while it still owns undone work
does not close that work, it hides it. What it owned:

- **R1** (supersede cancellation budget, *measurement design*) → the
  **async-runtime lane**, below. Its retirement condition is Q#MCI3:
  replace or justify the measurement. Widening the budget would make it
  pass and measure nothing more.
- **R3** (live-leader EPERM, **UNRESOLVED — possible product defect**)
  → the **reap-ledger lane**, below, which already parks every
  disposition change pending exactly this question.
- **R5** and **R6**, added 2026-08-06 and neither diagnosed → the
  async-runtime lane and a **readiness-helper audit** respectively.

### The rows are the state now, not this block

An occurrence scan on 2026-08-06 (last 25 `main` runs: 23 green, 2 red)
turned up two things worth recording as method rather than as trivia.

**A signature very nearly got misfiled by theme.** `main` run
30710662474 is the same test as R3, with `EPERM` and
`measured_group=unobservable(ESRCH…)` — and R3 requires `leader=live`
where that run reads `leader=exited(signal SIGUSR1)`, which is R2's
exact fragment. Read by test name and shared fragments it looks like
R3; read by required fragment it is R2, four days before R2's
retirement, on the *other* macOS flavor. **Attaching a live unresolved
product-defect row to an occurrence of a retired test race is precisely
the error the exact-fragment rule prevents**, and it was caught by
checking the fragment rather than the resemblance.

**A second red matched nothing at all** and became R5, rather than
being folded into R1 because both involve supersede under a deadline on
macOS. Sharing a subject is not sharing a signature.

### Async-runtime lane — NOT STARTED, owns R1 and R5

No branch, no framing. Owns **R1** (Q#MCI3: the 50ms budget starts
before the second dispatch and is consumed by the test's own pump, so
it measures when the test was scheduled) and **R5**
(`stream_supersede_delivers_cancelled_to_on_close`, `async pump
deadline exceeded`, undiagnosed). Filed together because both are the
async runtime under a deadline; they are **not** assumed to share a
cause.

### Readiness-helper audit — NOT STARTED, owns R6

No branch, no framing. **Three independently written readiness helpers
now exist**, and they disagree: `vterm_stage2_acceptance`'s waits for
expected content (hardened by #216), `wait_for_published_file` was
fixed with it, and
`tests/bottom_panel_stage1_acceptance.rs:2446` carries only the
zero-byte half. R4's disposition predicted this recurrence under a new
selector, and R6 is it.

**Scope is the audit, not the call site**: how many helpers exist,
whether they can be one, what each promises. Patching `acc28` alone
leaves the question open under a fourth selector — which is the same
mistake as fixing `wait_for_file` and leaving
`wait_for_published_file`, already made once in this arc.

## CI CRDT coverage — MERGED (#209); kept for its three follow-ons

**Rewritten, not removed.** Rule 4 removes a lane when its ARC is done;
the coverage itself has landed but three named follow-ons have not.
Durable facts — the corrections, the traps, the census tool — are in
`docs/agent-handoff.md` §§1/5 per rule 3, so they are not repeated here.

- **MERGED as #209** (`main` @ `c5f7501`, 2026-08-01, two review rounds),
  framing `docs/ci-crdt-coverage-framing.md` revision 5. The lane had sat
  under "NEEDS A LANE" with no branch and no owner since #166.
- **CI compiles and runs the CRDT corpus for the first time.**
  `Test (crdt)` runs **3,766** tests where none ran before;
  `M10 Perf Gates (crdt)` covers two suites no workflow had ever named;
  `cargo clippy --features crdt` is enforced going forward rather than
  being a required local gate that rots in CI. **275 of 279 dark tests
  recovered**, the other four excluded with stated reasons.
- Branch `ci-crdt-coverage` retained; it carries nothing unmerged.

### Two CI weaknesses Stage 3 exposed — decisions, not defects

Both surfaced while gating #213 and belong to this lane because it owns
the crdt job.

- **CI does not pass `--no-fail-fast`, so a multi-suite break reports as
  a single-suite one.** `cargo test` halts after a failing binary, so
  #213's first crdt failure showed **one** suite when a local
  `--no-fail-fast` sweep of the same tree showed **thirteen**. The
  Stage 3 census hit the identical trap and recorded it; CI has it too.
  The cost of the flag is running the remaining suites on a red build,
  which is usually what you want when diagnosing.
- **The crdt job pairs the heaviest build with real-PTY deadlines.** It
  installs lavapipe, builds the full workspace with `crdt`, runs the
  largest test count, and includes real-PTY smokes with **5-second**
  waits. #213 saw two different such suites fail on two runs of the
  same commit. One of those was a real regression the flip caused; the
  other was load. **That ambiguity is the problem** — a job where noise
  and signal look alike trains people to rerun rather than read.
  **The triage half of this is now owned by
  `docs/ci-red-signatures.md`** — signature-keyed rows and a rerun rule
  that refuses to treat a green rerun as an all-clear. What remains here
  is the job-cost question: whether the crdt job should carry real-PTY
  deadlines at all.
  Candidate: longer deadlines for real-PTY assertions in this job
  specifically, or serialize the PTY suites.

### Still owned by this lane, not yet done

- **The macOS `crdt` leg.** Deliberately ubuntu-only at first, "decide
  about macOS from evidence." **That evidence now exists** and is
  favourable: the non-crdt macOS legs pass at 3,474 (thirteen fewer than
  ubuntu's 3,487 — `cfg`-compilation of the Linux-gated process tests,
  not lost coverage), and no crdt-specific failure appeared anywhere.
  This is now a small, decidable addition rather than an open question.
- **The `--lib --features crdt` flake.**
  `process::tests::setsid_escapee_is_not_reaped_and_teardown_reclaims_readers`
  failed ~1 run in 5 with `active_reader_probe` returning `None`.
  **It did not reproduce in #209's runs** — `--lib --features crdt` was
  2,081/2,081 and the full serialized sweep clean — but that is *not*
  evidence against the hypothesis: every run was `--test-threads=1` and
  the trigger was observed under **parallel** full-suite load. The
  `drain_until` explanation (draining for `Started` also ticks, and a
  tick can reap the leader before the following probe) remains an
  inference from control flow, not a falsified root cause. **Its own
  PR** — a product-defect hypothesis, where everything in #209 was
  workflow configuration.
- **`InstanceCapabilities::crdt_replica`'s serde default.**
  `#[serde(default = "default_true")]` is a *third* default mechanism,
  unconditional, and therefore disagrees with the `Default` impl in a
  non-CRDT build. Exercising it needs a self-describing format and
  `pmacs-protocol`'s only serde dependency is postcard, which is not
  one. Adding `serde_json` as a dev-dependency to test a divergence
  #209 did not introduce was refused as scope creep. Parked, not
  forgotten.
- **The two unattributed CRDT failures from #178's round-2 gating.** No
  test names were captured, so there is nothing to reproduce.

Recovery, only if a follow-on needs the branch:

```sh
git worktree add ../pmacs-ci-crdt \
  -b ci-crdt-coverage-followup \
  githubsucks/ci-crdt-coverage
```

## Distribution (P8) — STAGE 1 SHIPPED as v1.1.0 (#211)

**Rewritten as a lane rather than removed**: the arc is not done — Stage
1 was scoped to binaries-on-tag and everything else in §17 is untouched.
Framing `docs/distribution-stage1-framing.md` revision 3. Durable facts
are in `docs/agent-handoff.md` §1.

- **Released 2026-08-01.** `v1.1.0-rc.1` (prerelease) then `v1.1.0`,
  **both cut from the same commit `000b6cd`** — the #211 merge SHA — so
  the final release was built from byte-identical source to the one whose
  artifacts were verified.
- **Verified against the DOWNLOADED artifacts, both tags, not the build
  logs:** archive member lists (exactly `pmacs`, `pmacs-gpu`, README, two
  licenses), executable bits, absence of `pmacs-audit` /
  `pmacs_fake_lsp` / `pmacs_fake_mcp`, `pmacs --version` = `1.1.0` and
  `pmacs-gpu --version` = `1.1.0 (protocol v21)`, `SHA256SUMS`, the
  glibc floor, and CRDT presence **against a non-CRDT negative control**
  (1,576 `loro` strings shipped versus **0** in a control build — the
  control is what makes the number mean anything).
- **`pmacs` alone needs only glibc 2.34; `pmacs-gpu` needs 2.35.** The
  stated floor is the pair's, 2.35, not the more flattering single-binary
  number. That is why RHEL 9 (2.34) is excluded even though the editor
  binary would run there.

### Still owned by this lane, not yet done

Each is a stated non-goal of Stage 1 (framing §5), not an oversight.
**The next increment is a decision about which of these the project
wants, not a continuation of a plan.**

- **Channels** (stable/nightly), **in-place update**, **rollback**.
- **Signing and notarization.** macOS binaries are Gatekeeper-quarantined
  today; the release notes say so.
- **RHEL 9 and older glibc** — needs a container or cross-build, not a
  runner change.
- **Intel macOS**, **Windows**, **reproducible builds**,
  **package-manager distribution**.
- **Runtime dependency checking.** §17 asks first launch to identify
  optional external tools; `/bin/sh`, `stty`, git and tar are documented
  and never checked. That is §18 onboarding work.

## Discovery lane (P4) — STAGE 1 MERGED (#207); STAGE 2 IS NEXT

**Rewritten, not removed.** Rule 4 removes a lane when its ARC is done;
this arc is not — Stage 1 built the command surface and everything that
needs a Rust change is still ahead. Stage 1's durable facts are in
`docs/agent-handoff.md` §1.

- **Landed:** eleven `help.*` commands over the existing registries,
  indexed by `M-x help`, with `editor.describe-command` /
  `editor.describe-setting` kept as forwarders. No Rust, no protocol
  change. §5 moved substrate-without-surface → **Partial**.
- **Stage 2 candidates, in rough dependency order:**
  1. **Richer M-x rows** — a **protocol change**:
     `MinibufferPrompt.candidates` is `Vec<String>`, while
     `CompletionPopupRow` already carries `kind`/`detail`, so the wire
     pattern is solved and the bump is the work.
  2. **`Command` gains title / category / aliases / flags /
     arg-schema** — a Rust type change across ~147 definition sites.
     MCP currently works around the missing schema by stuffing rendered
     JSON into the description string.
  3. **Predicate evaluation.** `Command.predicate` is read at
     `src/help.rs:76` and one test, and **evaluated nowhere**. Starting
     to evaluate it makes commands stop being invocable, so it needs its
     own decision about what "unavailable" means at each call site —
     M-x, dispatch, menu. `discovery_acceptance`'s `d9` pins today's
     behaviour with a *raising* predicate, so that stage must change the
     pin knowingly.
  4. **Help-layer unification.** `src/help.rs` is still orphaned. Stage 1
     funnels every command through `pmacs.editor._show_help` and renders
     via named per-subject functions, so the work is enumerated:
     replace the four subjects `src/help.rs` covers (key, mode, hook,
     buffer) and **write three new Rust renderers** for settings, lists
     and apropos.
  5. **The help prefix.** Deliberately untouched by Stage 1 — the
     decision is one for the whole family, and `C-h` is **not** free
     (non-kitty terminals cannot disambiguate Ctrl+Backspace from
     Ctrl+H; both produce byte 0x08). `F1` / `C-c ?` / a rebind are the
     candidates.
- **Two Stage-1 facts a Stage-2 author needs.** Completion is
  **assistance, not validation** — `resolve_accepted_value` returns the
  literal typed text when no candidate is selected, so closed-set
  acceptance is unbuilt Rust work. And **`invoke_interactive` is not the
  M-x path**; the forwarders learned that the hard way in CI, since
  `pmacs.command.invoke` is a real caller of the old names.

## Generated-buffer immutability lane (Arc: workbench primitives) — STAGE 1 MERGED; STAGE 2 IS NEXT

**Framing #188 (revision 7) and Stage 1 #191 are both on `main` @
`4cd4a7b`.** Their durable facts are in `docs/agent-handoff.md` §1 —
including the contract-ownership rule (the framing owns the acceptance
criteria; an implementation adopts them and may not restate or narrow
them) and why `dired`/`listview` were the correct first two families.

- **Stage 2 is not started and has no branch.** It owns everything with
  new Rust in it: `Buffer::apply_generated_edit` + `GeneratedOutcome` +
  the `{ generated = true }` option and its `run_buffer_edit` arm;
  `set_generated_contents` reimplemented over it; Q#GB10's path-backed
  refusal and `mark_clean`; Q#GB15's `identity_protected`; Q#GB13/GB18
  for `compile.lua` and the search panel; Q#GB5's `ensure_slot` lock;
  the remaining 13 write sites; and the three `compile_mode_acceptance`
  intruder tests converted per Q#GB12.
- **It collides with dired Stage 2b**, which changes `paint`'s callers.
  Whichever starts second integrates first.


## Reap-ledger silent failures — MERGED (#202); kept for its parked follow-ons

- **Branch `reap-ledger-silent-failures`**, worktree
  `../pmacs-reap-ledger`, based on `githubsucks/main` @ `22df6ab`.
  `docs/reap-ledger-silent-failures-framing.md`, **revision 4**;
  approved at revision 3 after two review rounds (round 1: three
  blocking, two major; round 2: two blocking, two major; all accepted).
  Revision 4 records implementation findings, not a new design round.
- **All four bets resolved.** Bet 1 (every site takes a directed
  outcome) and Bet 2 (every consequence is reachable) hold. **Bet 3
  resolves the shutdown coupling as real and measured** — under 500ms
  with a failed force-kill plus an errored probe, versus the full 2s
  bound with only the force-kill failing. **Bet 4 is falsified: no
  reporting channel exists**, so reporting becomes its own lane.
- **The in-drain pin's first fixture was vacuous, and the bite caught
  it.** `poll_one` TERMs the group on leader exit, so an untrapped
  descendant died before writing its late marker — absent on *both*
  paths. With the seam reverted the pin failed only the consumed-plan
  check, never the content assertion. Fixed with `trap '' TERM` behind
  the readiness gate.
- **Gates: 10/10 green** on the pushed tree, all five bootstrap-storage
  variables controlled — fmt, diff-check, clippy, `--lib` (1888),
  `--lib --features crdt` (2073), compile-mode (67), copy-mode in both
  feature configurations (18/19), M4 with the basedpyright skip (149),
  required GPU (221). The five new process pins ran **15/15** as a
  repetition set, since supervisor tests are load-sensitive.
- **Unparked from PR #200's §5.** #200 retired the premise that
  justified the ledger's leniency and deliberately changed no
  disposition; this lane owns what it refused.
- **Now also owns R3**, re-homed 2026-08-06 when the macOS CI
  signal-integrity arc retired. `docs/ci-red-signatures.md` R3 is a
  group-directed `kill` returning **EPERM while the leader was observed
  live**, with `measured_group` — the one field able to disagree —
  unreadable. It is the **same group-target question** #176 and #200
  circled and this lane parks every disposition change pending, which
  is why it lands here rather than staying with a retired CI lane. Its
  registry entry is explicit that it is an **unresolved possible
  product defect** and that **a green rerun never retires it**; that
  constraint travels with the row, not with whoever inherits it.

  Note what it is *not*: R2 is the same test with `leader=exited(signal
  SIGUSR1)`, a test race, retired. An occurrence scan on 2026-08-06
  nearly filed a second R2 occurrence here as R3 on the strength of the
  shared test name and shared `EPERM` fragment. **`leader=live` is the
  fragment that separates a product-defect candidate from a fixed
  fixture bug**, and it is the whole reason the row lists it.
- **Four sites, not the two #200 named.** In the persistent ledger: a
  probe error of any errno drops the entry and cancels escalation; a
  failed escalating `SIGKILL` is marked as succeeded, so **no later tick
  retries it**; and `shutdown()` discards its own force-kill result the
  same way — on the path that exists specifically to stop a leak at
  editor exit. Those last two are **distinct, not cumulative**:
  `shutdown()` force-kills every entry with no `!entry.killed` guard, so
  a failed escalation still gets one attempt at exit, while a failed
  force-kill leaks the group past exit with nothing left to try.
  **Plus the in-drain
  twin** `final_drain_runtime`, which collapses every errno to "dead"
  while no tick runs; a false "dead" there cancels the readers, so its
  failure mode is truncated output rather than a leaked process.
- **The blast radius is exactly what the ledger exists for:** a
  TERM-ignoring descendant that outlived its leader with output
  redirected. Neither leader state nor reader state can see it; only
  group liveness can. A silent drop leaks the one process nothing else
  is watching. **Journey step 9 (build/test), not step 8** — the ledger
  arms only for `spec.group`, which spawn rejects for PTY mode, so no
  terminal reaches it; compile mode is the only production caller.
- **`shutdown()`'s final loop terminates when the ledger empties**,
  which happens via the same silent drop — so the probe error that hides
  a leak can also end the cleanup loop early. That coupling is why the
  probe cannot be made strict on its own. **Its precondition is
  `any_running()` already false**, so the fixture must be a leader that
  exited leaving a survivor; any other shape tests the other arm of the
  disjunction.
- **None of the three has been observed.** #200 saw an explicit
  `SIGTERM` fail in `signal()`, not a ledger call. The premise is
  falsified and the path exposed; the occurrence is not evidence these
  fire.
- **They are also untestable today**: `tick_reap_ledger` and
  `shutdown()` call `nix` directly and consult no injection seam, unlike
  `signal()`'s `forced_kill_errno`. All five existing ledger tests
  exercise the success path only. The seam must be **site-directed and
  multi-outcome**: `shutdown()` calls `self.signal()` before its ledger
  force-kill, so a single global slot would be consumed by the wrong
  call, and the coupling test needs two pending outcomes at once. The
  in-drain probe repeats every 1 ms but only cancels readers after 50 ms
  of false "dead", so it needs a directed full-drain override rather
  than a one-shot error. Test state is per-supervisor and shared into
  the drain context, never global; teardown proves its intended site was
  reached. The in-drain SIGKILL's local flag has no independently
  observable outer-path consequence, so it is named but not given a
  dead injection seam. The first PR is the seam **plus** the tests that
  exercise it — a seam without tests does not show it reaches the
  intended calls.
- **Diagnosis first, no disposition change proposed.** Stage A of the
  signal lane had three tolerance rules rejected across three revisions
  for the same shape of error on the same data structure.
- Recovery from a clean checkout:

  ```sh
  git fetch githubsucks
  git worktree add ../pmacs-reap-ledger \
    -b reap-ledger-silent-failures \
    githubsucks/reap-ledger-silent-failures
  ```

## Folding lane (Arc 6) — Stages 1 and 2 MERGED; Stage 3 (GPU) is next

Both shipped stages are on `main`; nothing in this arc is in flight. Stage 3
has **no branch and no framing yet**.

- Stage 1 (headless fold engine) merged as **#142**, Stage 2 (grid/daemon
  collapse) as **#149** — both under "Closed since the last snapshot".
- Retained, carrying nothing unmerged: branches `folding` / `folding-tui`
  and worktrees `../pmacs-folding` / `../pmacs-folding-tui`. The framings
  `docs/folding-framing.md` (rev 5) and `docs/folding-stage2-framing.md`
  (rev 4) are the approved artifacts Stage 3 re-scouts against.
- **Stage 3 (GPU) obligations, already named by the framings** — the
  starting point for its own framing doc: GPU collapse at TUI parity;
  caret/hit-test fold-awareness; the `BufferSnapshot` **fold-mirror clear**
  (parent R2-4 — without it, empty-after-revert diff suppression leaves
  stale folds on the GPU, the same trap class as #120); CRDT-origin and
  GPU-optimistic interactive unfold (parent R2-3); and flipping
  `FrontendView.fold_projection` to `true` for semantic frontends, which
  Stage 2 deliberately left `false` (Q#FD21).

## Parked lane: kill-ring browser + persistence

- Portable branch: `githubsucks/kill-ring-browser`
- Parked framing head: `503c489`
- State: framing only, revision 2; no implementation and no PR.
- Status: explicitly parked by the user on 2026-07-20.
- Its original scout was based on `0efb5cd`. The preserved framing marks
  this ground truth stale and requires a complete re-scout against the
  then-current `githubsucks/main` before implementation.
- Compile-mode has merged since the original scout, so old
  “compile-mode in flight” keybinding/touch-set assumptions are not
  authoritative.

Recovery worktree, only when the user un-parks it:

```sh
git worktree add --track \
  -b kill-ring-browser \
  ../pmacs-kill-ring-browser \
  githubsucks/kill-ring-browser
```

## Closed since the last snapshot

- **Process-signal diagnostic completeness — MERGED as #200**
  (`main` @ `a2a92bb`), atop Stage A #176. `docs/process-signal-diagnostic-completeness-framing.md`
  revision 6; framing approved at revision 4 after three rounds, then
  five review rounds on the implementation. Durable facts are in
  `docs/agent-handoff.md` §1. **Evidence collection only** — no
  tolerance rule, no retargeting, no disposition change.
  - **Bet 1 was falsified by CI and the framing's own fallback shipped.**
    `bash -m` diverges the terminal's foreground group on Linux and
    never on macOS. The divergent case is pinned by injection
    everywhere; a Linux-only corroboration drives a real shell and is
    the **only** test exercising `pty_foreground_group` end-to-end, so
    **on macOS that lookup has no end-to-end coverage**.
  - **Group identity remains unprovable**, and the pre-kill sample does
    not change that: moving `getpgid` before the `kill` removed a
    post-hoc reading, it did not make the reading contemporaneous.
  - **Still parked, each needing its own lane:** the reap ledger's
    silent cancellation (an EPERM probe drops the entry; a failed
    `SIGKILL` is marked killed) — **being scoped next**; retargeting to
    the measured pgid; any EPERM/ESRCH tolerance rule; Q#PS6; and
    `signal_target`'s read-then-kill of `tcgetpgrp` on the PTY path.

- **Six lanes removed by the 2026-07-30 absorption pass**, all merged,
  all with their durable facts in `docs/agent-handoff.md` §1:
  **#190** resource-op delete-guard implementation; **#196** dired
  Stage 2a (rename/delete reconciliation — Stage 2b remains, unstarted
  and without a lane); **#188** generated-buffer immutability framing
  (revision 7, the governing contract); **#194** silent-skip arming;
  **#195** CI timeouts and concurrency; **#197** the process teardown
  stdin deadlock.
  - **#194 and #195 kept their lessons in §3 and §5 rather than §1**,
    which is why a PR-number search of the handoff finds them only once
    each. That is sufficient under rule 3 — durable knowledge has a
    home, not a required section.
  - **A census by PR number is a proxy, not a measurement.** Counting
    `#NNN` in the handoff said five of these lanes had no record at all;
    counting by *content* found most already documented, with the real
    gap being the implementation PRs specifically (#190, #191, #196)
    while their framings were recorded. The absorption written from the
    first count would have duplicated existing entries.

- **Terminal configuration + copy mode arc — BOTH STAGES MERGED, lane
  removed.** Stage 1 **#173** (`main` @ `cf54270`, one review round) and
  Stage 2 **#178** (`main` @ `fe8b8ba`, **four review rounds**, twelve
  checks green on head `1b44c69` — verified by `head_sha`, not by the
  check summary), both 2026-07-26, both with no protocol change.
  Approved framing: `docs/terminal-config-and-copy-mode-framing.md` rev
  4, committed as the first commit of Stage 1's branch; its Q#TC6a
  carries a superseded-in-part box rather than a silent rewrite. Durable
  facts moved to `docs/agent-handoff.md` §1 (the arc bullet) and §4 (the
  `set_generated_contents` invariant) per rule 3 below, and to
  `COHERENCE.md` §14. **Stage 2 ships eight of nine criteria and the
  missing one is named** — criterion 17 needs a real GPU frontend, so it
  waits on the `a37` footing; the handoff records what it must assert.
  Branches `githubsucks/terminal-config` and
  `githubsucks/terminal-copy-mode` with worktrees
  `../pmacs-terminal-config` and `../pmacs-terminal-copy-mode` are
  retained. The gate-run flake found while gating #178 moved to the CI
  `crdt`-coverage lane above, which owns its discrimination.
- **Dired Stage 1 (the directory view) — MERGED as #165** (`main` @
  `c8ec8f3`, 2026-07-25, after one review round). pmacs has a directory
  surface: `C-x d` / `C-x C-j`, one read-only buffer per directory named
  `*dired:<canonical path>*`, a `dired` major mode carrying
  `RET`/`f`, `^`, `n`/`p`, `g`, `q`, `s`. No wire change (v20). The Rust is
  two things — a per-entry-tolerant `read_dir` (Q#DR6), which had to be
  Rust because `read_dir_blocking` fails a whole listing on any of five
  per-entry conditions and a tolerant wrapper cannot be written in Lua at
  all, and `normalize_buffer_path` going `pub` as
  `pmacs.path.canonicalize` (Q#DR2's preferred end state, so no Lua mirror
  exists and Stage 2 owes no mirror removal). The frozen m8_1/m8_2/m8_3
  counts are unchanged, which is the additivity gate. 15 claims
  bite-verified; one came back VACUOUS (acceptance 3c cannot pin descent
  routing — dired holds focus in its own panel, so dedication is the only
  discriminator) and is documented at the assertion rather than
  relabelled. Its branch (`dired-stage1`) and worktree
  (`../pmacs-dired-stage1`) are done; the abandoned `dired` branch
  (`ffdd642`, `../pmacs-dired-arc`) was superseded by a fresh cut and
  carries nothing unmerged. **Stage 2 (marks and operations) and Stage 3
  (wdired) each still need their own framing**, and the frozen fixture
  shrinks after Stage 3. Durable substrate facts and both new ops lessons
  live in `docs/agent-handoff.md` §§1/5; the implementation notes are
  `docs/dired-framing.md` §0, S1-1…S1-12. Two named forward items for
  Stage 2: `apply_resource_op`'s rename rebind is exact-PathBuf-equality,
  first-match-only, looked up with the raw path while stored paths are
  normalized — so a directory rename strands every buffer under it, and
  `pmacs.fs.rename` has zero production callers, so it can be fixed at
  the primitive; and Q#DR5's seam is the main-thread drain
  `AsyncRuntime::tick`, not `_take_result`, where rename settles as an
  undifferentiated `ReplyKind::FsUnit` and so must be keyed on
  `JobKind::FsRename`.

- **GPU terminal input (the double terminal-layout sync) — MERGED as #166**
  (`main` @ `b889873`, 2026-07-25, one review round, all twelve checks green
  after a macOS PTY-timing rerun). The dispatcher applied **both**
  terminal-layout syncs to **every** attached frontend; a semantic session
  satisfies both conditions, so its PTY was resized twice per tick forever and
  the child took a `SIGWINCH` storm that made a GPU terminal untypable while
  output still flowed. `sync_terminal_layout` is now split into a
  frontend-kind-neutral half (panel reconcile + controller liveness) and a
  grid-only geometry half, with the loop body extracted to
  `sync_terminal_layouts_for_tick` so the exclusivity is structural. No
  protocol change (v20). Durable lessons are in `docs/agent-handoff.md` §5;
  the framing (`docs/gpu-terminal-input-framing.md` rev 2) carries three
  falsified hypotheses, the two-pre-image bite matrix, and two named
  out-of-scope items (Q#GT5 interactive-shell echo on a raw PTY, which
  reproduces in-process and so is not the GUI/TUI asymmetry; and a geometry
  change appearing to clear the visible screen, which reproduces pre-fix).
  Branch `gpu-terminal-input` and worktree `../pmacs-gui-term-input` retained.
  **Its landed-doc pair MERGED as #168** (`main` @ `1b6a084`,
  2026-07-26): #166 recorded as landed, the CI `crdt`-coverage gap
  measured (**264 tests dark workspace-wide**, 177 in the library — a
  reading taken at `1b6a084` and kept here only as history. **The CI
  `crdt`-coverage lane above is the authority for the live figure**;
  do not quote this one forward), the
  vterm audit corrected — "only 3 of 9 acceptances drive a real daemon"
  was optimistic; without the frontend binary the honest number is
  **2** — and the a37 findings folded into the coverage lane.
- **Inline-math slice — MERGED as #158** (`main` @ `5aa9044`,
  2026-07-25). Detect → parse → layout → draw for `$…$`, entirely inside
  `pmacs-gpu`, no protocol change. Verified by the user's manual pass on
  a real paper after the landing. What is worth carrying forward:
  - **The v0 subset is 34 Greek symbols, sub/superscript, and `\frac`.**
    An unsupported command fails the **whole span** back to source, so on
    a real document most inline spans still show LaTeX. Widening the
    symbol map is the highest-value next increment — ahead of display
    math, which is also deferred.
  - **A stale frontend binary is invisible from the source tree.** The
    slice lives only in `pmacs-gpu`, so after it merged the feature was
    absent until `cargo build --release -p pmacs-gpu` and a client
    restart; the daemon needs neither. Diagnose with `strings` on the
    binary (`Latin Modern Math`, `MathBox`) rather than by re-reading the
    checkout, which was already current.
  - **Main was integrated three times in one day** (`8c86d34`,
    `46a1b8f`, `b889873`), merged not rebased to preserve review anchors.
    Two conflicts, both this ledger and nothing else. **The dangerous
    case was the one that did NOT conflict**: #166 auto-merged into
    `pmacs-gpu/src/main.rs`, the file this lane rewrites, because the two
    edits sat in different regions of it. Decide whether to integrate
    from the shared-**file** set, never from whether git complained.
  - **Integration was proved by test-count reconciliation**, not by a
    green run: predict what the other side adds, then check the deltas.
    GPU 199→202 matched `e547a90`'s 3; later lib 1,826→1,829 and CRDT
    2,003→2,006 matched #166's 3, with GPU unchanged because #166 adds
    none. Suites 91→92 was #161's new binary.
  - **Why the branch had no CI for a day**: a conflicting PR builds no
    merge ref, so no `pull_request` run is created. The ledger previously
    recorded this cause as unidentified; it is not. Check `mergeable` and
    confirm a run exists for the current head SHA.
  - **`m4_5_basedpyright` has no timeout and hangs forever**, parking a
    `--workspace` sweep (observed 2h26m at 38 of 92 suites). It is
    **intermittent**, so an earlier clean sweep proves nothing. Sweep with
    `cargo test --workspace --no-fail-fast -- --skip basedpyright` and
    judge progress by whether the suite count advances.
  - Named v0 approximations: the peer-caret half of acceptance 14 is
    pinned at the mapping level, not pixels; a soft-wrapped spacer draws
    its box whole at the first run's origin; the fit budget reads the
    bundled code face even under a custom `set_font` family.
- **Bottom panel Stage 1 — MERGED as #155** (`main` @ `e745068`,
  2026-07-24, after two review rounds). Window placement, window
  parameters, TUI side windows, the divider, and the adopter `display`
  opt-in, with no protocol change. Both rounds found the same class of
  defect and are worth keeping:
  - **Round 1**: the Q#BP6 side-window split guard had *no production
    caller* — `C-x 2` still reached plain `split_active` — and survived
    because the acceptance test called the core method directly.
  - **Round 2**: Q#BP7's terminal growth re-arm had *never been
    implemented*, and the assertion meant to pin it (`at_bottom`) is a
    geometric readout that a still-anchored view satisfies; the anchor
    assertions beside it compared `""` with `""` because the PTY fixture
    emitted LF-only output.
  - **Post-round-2 self-review**, caught by CI going red on all four Test
    jobs: resolving `pmacs.window.buffer()`'s no-argument arm through the
    acting frontend made a total function partial, and six runtime modules
    silently dropped operations (`kill_ring_acceptance` 30/30 → 25/5).
    Fixed in `9110f9f` before merge.
  - Gating fact found on the way: an isolated `XDG_CONFIG_HOME` prevents
    the real user `init.lua` from installing a local package and leaking
    a status message into painted-frame comparisons. **That isolates the
    observed config symptom only, not the gate:** the ambient-root lane
    above establishes that data/state/cache must be controlled too.
    There is also a latent pre-existing `main` bug in the buffer CRDT
    undo path, unrelated to this arc.
  - `compile_mode_acceptance` is load-sensitive under default
    parallelism (~1 run in 3, a different test each time); verified
    pre-existing by swapping in `main`'s `compile.lua`. It is 67/67 at
    `--test-threads=1`.

- **GPU initial target — MERGED as #148** (`main` @ `0dd16a5`, 2026-07-24,
  after two review rounds). `pmacs --gpu [--socket …] FILE` opens a target
  before the GPU window appears. Protocol bumped 19 → 20: a semantic-session
  `SessionBootstrapRequest` after `AttachRequest`, plus an appended
  `InstanceMessage::InitialTargetResult` pre-window readiness barrier; v6–v19
  wire encodings are unchanged. Root owns launcher tilde/cwd resolution and
  exact raw-byte path transport; the daemon resolves/dedups/loads the target
  and runs load/switch hooks inside one dispatcher transaction, then
  publishes CRDT-upgraded targets to existing grid replicas (gated on
  `upgraded_to_crdt`, independent of the load/create outcome, so a dedup onto
  a hidden not-yet-backed buffer still reaches pre-attached replicas — round
  2 finding). Semantic replicas receive a publication only when displaying
  that buffer, so a second target launch cannot switch an existing GPU
  window. Round 2 also closed a failure-containment gap: every dispatcher-side
  bootstrap failure now shuts down the socket (a dropped write-half clone
  does not close a shared FD), and the dispatcher drops any event from a
  session that was never installed, rather than reaching absent render/size
  state. Integrated cleanly with Folding Stage 2 (#149): fold projection at
  attach is selected from the same negotiated `semantic_render` bit the
  target bootstrap uses. Its lane, worktree (`../pmacs-gpu-initial-target`),
  and branch (`gpu-initial-target`) are done; the `-framing` branch is kept.
  Durable substrate facts and both review-round lessons live in
  `docs/agent-handoff.md` §§1/5 and `docs/gpu-initial-target-framing.md`
  rev 3.

- **Folding Stage 2 (grid/daemon collapse) — MERGED as #149** (`main` @
  `6ed4fe9`, 2026-07-24, after **five** review rounds). The grid TUI now
  renders collapses. Spine (Q#FD12): `src/fold_view.rs`'s `VisibleLineMap`,
  derived from the fold store plus a window's line offsets and **never
  stored**, threaded as `Option<&'a VisibleLineMap>` on a lifetime-bearing
  `Viewport<'a>` that stays `Copy`. No wire schema or protocol change; the
  GPU path is Stage 3. 48 acceptance tests on the real `paint_frame` grid,
  every behavioral claim bite-verified. Durable design points, each a trap
  Stage 3 inherits:
  - the map's unit is a **merged hidden component** (overlapping *or
    adjacent* intervals unioned, keeping the earliest visible head), not a
    fold — folds may cross, and a later fold's own head can be hidden;
  - instances are **per rendered window** and **per command/event
    operation**, never per frame; a command's map follows the operation's
    **target** window, since a wheel event names a pane without activating it;
  - fold projection is **per-frontend** (`FrontendView.fold_projection`) —
    shared `EditorCore` motion would otherwise make a simultaneous unfolded
    GPU session's cursor skip lines it still displays;
  - a hidden cursor normalizes by **position**, not row, and `set_view_top`
    clamps in the setter rather than being repaired at render time;
  - the interactive-Lua unfold keys on the **post-intercept** edit site — a
    managed buffer intercept may legally relocate the op.

  Process notes worth keeping: `main` moved under the arc, and the merge was
  textually clean but **not semantically clean** (#146 added `Viewport`
  literals the new `folds` field invalidated) — a clean `git merge-tree` does
  not mean the merged tree compiles. CI was red at review on the macOS/luajit
  `outline_5_level_100_entry_renders_within_100ms` budget flake and went
  green on rerun.

- **Documentation ledger refresh — MERGED as #147** (`main` @ `0a479ae`,
  2026-07-24). The #142 housekeeping, expanded after review found the ledger
  stale through four merges rather than one. Its own macOS/luajit red was the
  vterm `VTERM_ALT_READY` PTY timeout; green on rerun.

- **Web grammars HTML + CSS — MERGED as #146** (`main` @ `47581f4`,
  2026-07-23). `.html/.htm/.xhtml` and `.css` highlight off the official
  `tree-sitter-html` 0.23 / `tree-sitter-css` 0.25 crate query constants (no
  in-repo overlay), and HTML's `INJECTIONS_QUERY` lights up `<script>` → js
  and `<style>` → css. Durable lesson recorded in
  `docs/web-grammars-html-css-framing.md`: the `highlight.rs` capture table
  is **global**, so adding a capture name retro-paints every other language —
  check the reverse direction and pin it.

- **LaTeX Stage 1 — MERGED as #144**, with its parent inline-math framing
  committed as **#145** (`main` @ `f09b0a1`, 2026-07-23).
  `.tex/.latex/.sty/.cls` highlight via `codebook-tree-sitter-latex` 0.6 plus
  the first in-repo query overlay (`builtin/queries/latex/highlights.scm`,
  `include_str!`) — the reusable pattern for grammars whose crate ships no
  usable queries. The crates.io `tree-sitter-latex` is provably broken (no
  `scanner.c`). The math parser and Tiers 3–4 are deferred to the inline-math
  arc.

- **Folding Stage 1 (headless fold engine) — MERGED as #142** (`main` @
  `c49a8c7`, 2026-07-23, after three review rounds; round 3 clean). The
  instance-side fold store + translating/dropping `View`, the structural
  source (derived head line, closer-aware tail), the Lua data API +
  interactive `C-c @` commands, the command-path pre-edit unfold, and
  authoritative-empty `FoldState` production landed with no protocol bump.
  The `folding` branch and worktree (`../pmacs-folding`) are retained but
  carry nothing unmerged; the `folding-framing.md` framing is preserved.
  CI red at merge was an unrelated environmental perf flake
  (`outline_5_level_100_entry_renders_within_100ms`, macOS/luajit only),
  green on rerun. Stage 2 has since merged as **#149** (above); durable
  substrate seams live in `docs/agent-handoff.md` §1.

- **Vterm Stage 3 (protocol v19 + GPU terminal) — MERGED as #135** (`main`
  @ `cac4961`, 2026-07-22, after two review rounds). Arc 5's terminal stage
  is complete (compile mode #113, Stage 1 #126, Stage 2 #130, Stage 3 #135).
  Its lane, worktree (`../pmacs-vterm-gpu`), and branch are done; durable
  substrate facts live in `docs/agent-handoff.md` and `docs/vterm-framing.md`.

- **Branches deleted 2026-07-22 (authorized):** `vterm-stage3-framing`
  (Revision 8 framing; its content is carried on `vterm-gpu`, verified as a
  superset before deletion — the branch was NOT an ancestor of `vterm-gpu`
  because the framing was copied rather than merged, so it needed a forced
  local delete) and `tab-width-parity` (a clean ancestor of `main` via
  #137). Both removed as worktree + local ref + `githubsucks` ref; the
  `origin` tracking refs were pruned. The `-framing` branches for each are
  deliberately kept.

- **Tab-width rendering parity — MERGED as #137** (`main` @ `2625ec7`,
  2026-07-22). One fixed 8-column `TAB_STOP_COLUMNS` in `pmacs-protocol`
  now drives core/TUI columns, GPU code projection, and minimap width;
  source bytes and protocol ranges are unchanged. Its lane, worktree, and
  `tab-width-parity` branch (local + `githubsucks`) are deleted; the
  `tab-width-parity-framing` branch is kept. This closes the long-standing
  "tab width is a rendering-parity
  bug, NOT a config gap" deferral recorded in `docs/agent-handoff.md` §5.
- **Locals-query processing — MERGED as #134** (with handoff #136), and
  **modeline detection handoff #133**. Both landed between this lane's
  base and its canonical-main integration.

- **Config registry — MERGED as #127** (`main` @ `2e37c04`). Its lane
  (`config-registry`, worktree `../pmacs-config-registry`) is done; the
  branch is kept but carries nothing unmerged. Durable substrate facts
  moved to `docs/agent-handoff.md` §1 per rule 3 below.
- Both this and Vterm Stage 1 ran as **concurrent lanes in sibling
  worktrees off `main`**, with the shared files (`src/editor.rs`,
  `src/lua_bindings/mod.rs`, `src/lib.rs`) assigned to one lane each in
  advance. The rebase of the second lane onto the first had **zero
  conflicts** — worth repeating for future parallel work, along with its
  precondition: agree the file split before either lane starts, and keep
  each lane's footprint in the other's files to a single line.

## Update protocol

Whenever a listed lane changes materially:

1. update its public branch and head/state here;
2. record new verification and remove superseded caveats;
3. keep durable architecture in `docs/agent-handoff.md`, not here;
4. remove the lane after merge or abandonment;
5. verify every recovery command from a clean worktree before calling
   the transfer complete.