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Levi Neuwirth d03845e826 feat(bottom-panel): activate protocol v21 by frontend counter-offer 
Bottom-panel Stage 2B-3, part 1 of 3: the compatibility-preserving v21
activation mechanism and the negotiated `panel_capable` flip.

2B-1 reserved the v21 wire and 2B-2 built the daemon projection behind
it, both dark, because the handshake is server-first: the daemon writes
`Hello` before the frontend has said anything, and a frontend rejects a
`protocol_version` outside its supported range *before* it can send
`AttachRequest`. Advertising 21 there is therefore an incompatible act on
its own, independent of whether one new message is ever exchanged.

So the advertised version does not move. `ADVERTISED_PROTOCOL_VERSION`
becomes a permanent compatibility BASELINE, and the session's real
version is settled one message later, by the frontend:

  1. the daemon advertises the baseline (20, unchanged);
  2. the frontend answers `requested_protocol_version(baseline)` — its
     own `PROTOCOL_VERSION` when the baseline is the current one, and a
     verbatim echo of anything older;
  3. the daemon records `negotiated_session_version(offer)`.

A shipped v20 frontend echoes 20 and gets a v20 session, byte-for-byte
as before — the real-daemon acceptance that emulates its rejection point
still passes untouched. A current frontend offers up and gets v21. The
`Hello` encoding and value are unchanged, which is why the old frontend
never sees a version it must reject.

`peer_declared_panel_support` gains the arm 2B-2 deliberately left off:
a semantic session is panel-capable exactly when it negotiated
`PANEL_MIN_VERSION` or later. The gate is on placement, not only
transport, so a v6-v20 semantic session keeps the Stage 1 fallback.

The GPU client's `server_protocol_version` splits into
`session_protocol_version` (what the session speaks — every wire gate
keys on this) and `baseline_protocol_version` (what `Hello` advertised).
They now differ in the normal case, and that difference IS the
compatibility property, so both headless probe reports emit both keys and
the two ratchets that read them assert both directions: session 21 AND
baseline 20. Asserting only the session version would pass if the
baseline had been bumped too — the exact incompatible change this
mechanism avoids.

Also fixes a pre-existing `unused_mut` in a `crdt`-gated daemon test,
dark to the standard clippy gate because that gate runs without the
feature.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lv428Fth9LRtffwJSsqH7T
 		2026-07-29 17:42:08 -04:00
..
common Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
fixtures V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
support docs: record the pipe-masking gate trap in the handoff 2026-07-29 12:25:29 -04:00
acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
auto_indent_acceptance.rs fix(edit): PR #109 round 1 — shared search invalidation, daemon anchor clear, bounded indent scan 2026-07-10 15:46:36 -04:00
auto_indent_crdt_acceptance.rs feat(edit): auto-indent on newline (Arc 2) 2026-07-10 12:11:05 -04:00
auto_pair_acceptance.rs test(edit): PR #110 round 3 — pin raw-byte predicate posture and top-level sets guard 2026-07-12 16:20:01 +01:00
auto_pair_crdt_acceptance.rs feat(edit): auto-pairing (Arc 2) 2026-07-11 17:11:56 +01:00
autosave_acceptance.rs fix(persistence): adopt clears the old owner's skip cache; failing sweeps are loud 2026-07-09 12:06:49 -04:00
bottom_panel_stage1_acceptance.rs fix(window): keep pmacs.window.buffer() infallible with no argument 2026-07-24 20:05:51 -04:00
bottom_panel_stage2a_acceptance.rs fix(panel): close Stage 2A review round 3 (2 P1) 2026-07-26 13:18:05 -04:00
bottom_panel_stage2b_daemon_acceptance.rs Close PR 187 review round 2 2026-07-28 21:30:50 -04:00
bottom_panel_stage2b_protocol_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
comment_toggle_acceptance.rs feat(edit): comment/uncomment toggle on M-; (Arc 2) 2026-07-09 22:56:44 -04:00
compile_mode_acceptance.rs feat(fold): Stage 2 — grid (daemon-rendered) collapse 2026-07-23 19:24:07 -04:00
compile_mode_crdt_acceptance.rs fix(compile): PR #113 round 4 — column-counted CR rewrites, alt-screen style resync 2026-07-13 17:55:08 +01:00
completion_popup_acceptance.rs fix(lsp): range-only providers, completion-accept boundary, exact codepoint classify 2026-07-09 20:48:08 -04:00
config_registry_acceptance.rs fix(config): reject wrongly-typed spec fields; make trim-on-save buffer-aware 2026-07-21 18:29:18 -04:00
cua_region_acceptance.rs CUA type-over is a single undo step (Q#U1) 2026-06-15 20:00:53 -04:00
desktop_acceptance.rs fix(persistence): reliable daemon gate, unarm, per-pane after-load 2026-07-08 22:27:24 -04:00
dired_acceptance.rs fix(dired): address PR #165 review round 1 2026-07-25 15:21:26 -04:00
editops_acceptance.rs fix(edit): PR #111 round 1 — scalar-valid UTF-8, per-word capitalize, trim error reporting 2026-07-12 16:34:18 +01:00
find_file_acceptance.rs fix(find-file): review round 1 -- name the real test, pin two gaps 2026-07-25 11:33:46 -04:00
folding_acceptance.rs test(fold): address PR #142 review round 2 — pin the round-1 wiring 2026-07-23 14:25:28 -04:00
folding_stage2_acceptance.rs feat(window): window parameters, fixed extents, and the display policy 2026-07-24 13:53:14 -04:00
gpu_font_acceptance.rs test(font): wire acceptance suite + protocol/design docs (items 2-8, 15) 2026-07-18 11:46:44 +01:00
gpu_initial_target_acceptance.rs Implement session-scoped GPU initial targets 2026-07-23 19:03:25 -04:00
gpu_invocation_acceptance.rs feat(bottom-panel): activate protocol v21 by frontend counter-offer 2026-07-29 17:42:08 -04:00
injection_acceptance.rs fix(injections): PR #122 round 2 — sibling precedence, observable cap, docs 2026-07-15 12:07:21 +01:00
journey_acceptance.rs fix(journey): honor the captured window, not the selected one 2026-07-26 18:20:02 -04:00
kill_ring_acceptance.rs fix(edit): exact effective-edit verification for kill/yank-pop 2026-07-09 20:40:48 -04:00
lean4_server_acceptance.rs fix(lsp): close round-six Lean fallback gaps 2026-07-25 22:32:48 -04:00
lean4_stage1_acceptance.rs feat(lean): the Lean 4 language server (Arc 8 Stage 3b) 2026-07-25 17:40:02 -04:00
lean_input_acceptance.rs fix(lean4): count fan-outs where a claim cannot skip the count 2026-07-26 17:15:24 -04:00
listview_acceptance.rs feat(panels): listview module, Q#P6 round-trip seam, references panel 2026-07-07 20:15:46 -04:00
lsp_dispatch_seams_acceptance.rs test(lsp): gate the non-UTF-8 fixture on linux, not merely unix 2026-07-25 17:03:10 -04:00
lsp_multi_root_acceptance.rs fix(lsp): attribute a failing root resolver (COHERENCE §1.2) 2026-07-25 14:24:59 -04:00
m3_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m4_acceptance.rs merge: integrate main @ b7bf2c6 after PR 190 review round 2 2026-07-29 13:49:06 -04:00
m5_5_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
m5_6_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m5_7_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
m5_8_acceptance.rs tests: widen backoff timing signal 2026-05-25 13:32:54 -04:00
m5_perf_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
m6_4_repl_acceptance.rs Fix PTY final-output drain race 2026-05-04 09:44:30 -04:00
m6_5_repl_acceptance.rs review round 1: stop installing rust-analyzer on macOS, and paste the base 2026-07-29 12:20:28 -04:00
m6_7_scrollback_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m6_8_multi_repl_acceptance.rs review round 1: stop installing rust-analyzer on macOS, and paste the base 2026-07-29 12:20:28 -04:00
m6_perf_acceptance.rs tests: tune M6 hosted perf profile 2026-05-25 13:43:28 -04:00
m7_3_acceptance.rs Fix CI and Documentation issues 2026-05-04 10:19:19 -04:00
m7_5_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_6_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_7_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_8_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_9_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_10_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_11_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_review_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1_acceptance.rs Pin toolchain to 1.95.0 + mechanical clippy/rustc fixes 2026-05-18 11:38:57 -04:00
m8_1c_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1d_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_2_acceptance.rs tests: stabilize hosted perf gates 2026-05-25 13:20:18 -04:00
m8_3_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_5_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_6_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_7_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_9_acceptance.rs test(ci): diagnose the vterm PTY flake; drop the macOS outline budget 2026-07-24 10:34:36 -04:00
m8_10_acceptance.rs V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
m9_1_acceptance.rs T M4.5 async bridge: LSP requests settle async-runtime jobs 2026-05-18 19:36:17 -04:00
m9_2_acceptance.rs style: from_secs(1) for the m9_2 harvest wait (clippy duration units) 2026-06-10 12:07:08 -04:00
m9_3_acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
m9_4_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_5_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_6_acceptance.rs fix(vterm): harden view anchors and interactive authority 2026-07-22 09:09:44 -04:00
m9_7_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m9_8_acceptance.rs M9 ship gate 2026-05-09 15:04:23 -04:00
m10_2_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_postcard_unknown_variant.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_11_acceptance.rs M11.1: semantic-frontend protocol scaffolding (wire + capability) 2026-05-18 19:39:07 -04:00
m10_11_perf.rs M10.11: adversarial two-laptop acceptance + jitter; the M10 arc verified 2026-05-15 20:51:00 -04:00
m11_5_semantic_acceptance.rs Implement session-scoped GPU initial targets 2026-07-23 19:03:25 -04:00
mode_system_wiring_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
overlay_reattach_acceptance.rs fix(panels): follow active buffer on semantic frontends; re-attach overlays on switch 2026-07-07 20:46:50 -04:00
persistence_acceptance.rs fix(persistence): symlink confinement, real test-inertness, view_top restore 2026-07-08 18:21:46 -04:00
query_replace_acceptance.rs fix(query-replace): pin the session to its origin buffer (wrong-buffer guard) 2026-07-08 17:07:08 -04:00
save_clobber_guard_acceptance.rs fix(save): refuse to silently clobber a file changed on disk 2026-07-09 14:12:45 -04:00
statusline_segments_acceptance.rs test(protocol): advance touched-suite ratchets to v21 2026-07-27 22:39:15 -04:00
tab_width_acceptance.rs feat(fold): Stage 2 — grid (daemon-rendered) collapse 2026-07-23 19:24:07 -04:00
terminal_config_acceptance.rs fix(terminal): close review round 1 on Stage 1 2026-07-25 21:47:37 -04:00
terminal_copy_mode_acceptance.rs docs(terminal): restate criterion 17's bite for the fixed substrate 2026-07-26 14:38:22 -04:00
theme_faces_acceptance.rs fix(vterm): harden integrated Stage 2 behavior 2026-07-21 21:38:08 -04:00
typed_edit_chain_acceptance.rs fix(typed-edit): close round-8 review on the consumer chain 2026-07-26 13:39:33 -04:00
vterm_stage1_acceptance.rs fix(vterm): harden integrated Stage 2 behavior 2026-07-21 21:38:08 -04:00
vterm_stage2_acceptance.rs test(vterm): gate terminal readiness on a file, not on host bytes 2026-07-24 14:27:21 -04:00
vterm_stage3_acceptance.rs feat(bottom-panel): activate protocol v21 by frontend counter-offer 2026-07-29 17:42:08 -04:00
worker_shutdown_acceptance.rs fix(completion): address TUI-validation findings (LSP query gaps, scoping, prefix keys, window scope) 2026-07-07 16:54:14 -04:00