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docs: record PR #228 and its merge block 

The lane heading said "no PR yet". It also needs to carry WHY the PR is
merge-blocked, because a reader who finds only "blocked" will treat it
as backlog hygiene and unblock it by rerunning the gate.

The problem is gate integrity. --protocol promises the CRDT workspace
sweep, that sweep has a documented precondition (handoff section 5),
and the script does not run it --- confirmed by reading the plan
emitter, not inferred from the failure. So a --protocol result can be
decided by whether the build directory happened to contain pmacs-gpu
rather than by the diff under test.

It was latent until #225 gave each worktree its own target directory. A
shared target dir usually already had pmacs-gpu built, which satisfied
the precondition by accident and hid the omission.

Unblocking needs both halves recorded: the scripts/gate repair as its
own framing and PR, and then a fresh-target rerun of this branch
protocol gate under the repaired script. A rerun alone would reproduce
the same accident.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016bqGA6s9tTUFzYpbeW3tai
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Levi Neuwirth 2026-08-09 15:19:58 +02:00
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@ -265,7 +265,29 @@ also removed: this branch's "R8 NEEDS A LANE" investigation block, and
durable facts are in the retired registry row and the handoff §6 durable facts are in the retired registry row and the handoff §6
census. census.
## Discovery Stage 2 — IMPLEMENTED, no PR yet ## Discovery Stage 2 — PR #228 OPEN, **MERGE-BLOCKED**
**PR #228** — https://github.com/levineuwirth/pmacs/pull/228. Opened
2026-08-09 at `2d298dd`. **Open for review, not for merge.**
**The block is a gate-integrity problem, not backlog hygiene.** This
lane's gate is `scripts/gate --protocol`, which promises the CRDT
workspace sweep. That sweep's documented precondition is
`cargo build --workspace --no-default-features --features luajit,crdt`
(handoff §5), and **the script does not run it** — confirmed by reading
its plan emitter. On a fresh per-worktree target directory the sweep
fails on twelve `gpu_invocation_acceptance` tests missing the
`pmacs-gpu` binary, so a `--protocol` result can be decided by the
state of the build directory rather than by the diff.
Latent until #225 gave each worktree its own target dir — a shared one
usually already had `pmacs-gpu` built, satisfying the precondition by
accident. It surfaced on this branch's first gate run.
**Unblocking requires both:** the `scripts/gate` repair, in its own
narrow framing and its own PR (explicitly **not** folded into this
feature branch), and then a **fresh-target rerun of this branch's
protocol gate** under the repaired script.
**Written with the lane's first commit**, per the standing correction **Written with the lane's first commit**, per the standing correction
from #171 and #215. from #171 and #215.