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fix(composer): read a titled composer rule instead of discarding a live composer - #2495

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Inthuson:fm/composer-titled-rule-t4
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fix(composer): read a titled composer rule instead of discarding a live composer#2495
Inthuson wants to merge 7 commits into
kunchenguid:mainfrom
Inthuson:fm/composer-titled-rule-t4

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Intent

Decide whether firstmate's herdr composer-state fix is still needed after the upstream consolidation refactor 7f05100, then land it properly or retire it with evidence. The investigation found the original defect was actually two independent defects: defect A (a NO-BREAK SPACE after Claude's idle glyph being misread) is genuinely fixed upstream by the Unicode-space normalization, but defect B (a terminal-title overlay burned into the composer's top rule making the cursorless staleness rule discard a correctly matched live composer and return unknown) survived the consolidation verbatim and is still in the tree. Defect B is dormant rather than fixed: the shape stopped appearing on the live pane only because Claude changed what it renders, not because any code changed. The captain read that report and decided: LAND the defect-B fix.

The captain's decision names four required pieces, all of which are in this branch:

  1. The defect-B narrowing itself, in the cursorless selector in bin/fm-composer-lib.sh.
  2. The real-capture counterfactual as the PORTABLE regression test, so the test proves the behaviour regardless of which Claude version is installed. The captain called this the most important half of the change: the reason the defect looked fixed is that the test surface moved under us, and a version-dependent test would let that happen again.
  3. Closing the at-end rule-row gap the investigation found - the earlier attempt only recognized a titled rule whose row ends with a dash, so a title flush at the row's end still failed.
  4. Correcting the stale Claude-version-scoped record in docs/verification/runtime-backends.md, which claimed the guarantee for claude 2.1.226.634 focused panes specifically; the build has since moved twice and stopped rendering the overlay at all, so that record would have rotted into a false claim of coverage.

Constraints the captain set explicitly, all of which are deliberate and should not be flagged as oversights:

  • Fresh branch off current main. Do NOT rescue the earlier branch's PR 2170; that PR failed only the repo's "PR must be raised via no-mistakes" gate, and hand-editing a PR body to add the no-mistakes signature would forge the evidence that gate exists to check.
  • Do not replay the old diff blindly; re-implement against current main's consolidated classifier.
  • Keep the fix in bin/fm-composer-lib.sh, the one fleet-wide owner of composer shape classification. No adapter may carry its own copy.
  • Narrow the CONSUMER, not the structural separator predicate. _fm_composer_pi_separator_row is deliberately left strictly dashes-only because it also feeds the pi identity conjunction, where being wrong about what closes a separated composer would promote an unidentified blank region into an injection target. The new _fm_composer_rule_row is a separate predicate with a single narrow consumer, and its header says explicitly that the two must not be merged. That duplication-looking pair is the safety decision, not an accident.
  • Character-safe Unicode-space handling, never byte slicing. ${x#??}-style slicing would re-land issue herdr backend: prompt-glyph matching breaks under LC_ALL=C (bracket expression + ${content#??} operate on bytes) #883. Width is proven by comparing canonical space strings built by character-for-character substitution, the same idiom _fm_composer_titled_bottom_ok and fm_composer_geometry_spaces already use fleet-wide, because ${#row} counts characters under UTF-8 and BYTES under LC_ALL=C and a length test would silently disagree with itself between locales (issue Away mode never delivers: Claude's composer renders as ❯+U+00A0, which the classifier reads as pending instead of empty #1988).
  • Leave the dead-shell unknown rule and the strict blank-row posture untouched. Both are asserted in the new test so a future relaxation cannot hide behind it.
  • ASCII-printable-only title text is the deliberate, pre-existing fleet-wide limit shared with the two functions above. A non-ASCII title glyph leaves residue, fails the width proof, and the verdict stays unknown - a refusal to read, which is the safe direction. That boundary is pinned by a test because the live terminal title on the host that paid for this defect began with U+2733.
  • Harness-dependent behaviour needs two tests per firstmate's own coding guidelines: a portable regression in tests/ that CI can run with no harness installed, plus an env-gated live guard in the live-harness-optin family, plus a dated per-harness record under docs/verification/. All three are present.
  • The live guard's idle-pane check derives its expected verdict from the pane's own composer row rather than from herdr's agent state, because an idle agent whose operator typed and did not submit a message is legitimately pending; the earlier version demanded empty there and failed on the captain's own live draft.

Why the failing local test files are not this change's fault: 17 test files in this repo fail on pristine main at 6789876 as well (the teardown family, secondmate handoff, backend dispatch PATH contract, and others). The same 17 files were run against a real clone of pristine main and against this branch; the failure sets are identical except for one pre-existing flake that failed on main and passed here. bin/fm-lint.sh (pinned shellcheck 0.11.0), bin/fm-doc-audience-check.sh, tests/fm-composer-lib.test.sh, and tests/fm-composer-ghost.test.sh are all green on this branch.

Acceptance: the fix lives in bin/fm-composer-lib.sh with a portable regression that fails when only the consumer narrowing is reverted, the dead-shell rule and separator predicate are unchanged, no adapter carries a copy of shape logic, and no-mistakes itself raises the PR. The captain will decide the merge; do not merge it.

What Changed

  • Narrowed the cursorless staleness rule in bin/fm-composer-lib.sh: a new _fm_composer_bare_rule_sandwich exception spares a bare agent-glyph row whose closing separator sits immediately below it and whose row above reads as a composer rule, so a terminal-title overlay burned into Claude's top rule now classifies empty instead of unknown. The overlaid rule is recognized by a new _fm_composer_rule_row predicate — a separate consumer-side predicate that requires the same opening 8-column dash run, accepts a title mid-rule or flush at the row's end, and proves the row's width by comparing canonical space strings rather than measuring length. The dashes-only _fm_composer_pi_separator_row that gates pi identity, the dead-shell rule, and the strict blank-row posture are all untouched.
  • Consolidated the three duplicate column-count spellings into one fm_composer_column_spaces proof (with FM_COMPOSER_STRUCTURAL_LEADS and a byte-exact FM_COMPOSER_UTF8_CHAR_RE) shared by the new rule predicate, _fm_composer_titled_bottom_ok, and fm_composer_geometry_spaces; it refuses structural box-drawing glyphs, control bytes, and malformed UTF-8 including overlongs, surrogates, and code points above U+10FFFF. The two bordered callers keep their pre-existing ASCII-only content boundary through a new _fm_composer_ascii_only, so only the titled rule reads non-ASCII title text.
  • Added the portable regression test_matrix_claude_titled_composer_rule in tests/fm-composer-lib.test.sh, built from the shape rather than a captured pane, pinning divergence from the strict separator, mismatched-width rejection, the U+2733-style non-ASCII title, each refused byte class, edge adjacency, and the unchanged dead-shell/blank-row verdicts, plus both directions of the bordered ASCII-only boundary; extended the env-gated live guard in tests/fm-composer-matrix-live-e2e.test.sh to scan every live Claude pane, distinguish documented refusals from real regressions, and derive its idle-pane expectation from that pane's own composer row; and replaced the Claude-version-scoped record in docs/verification/runtime-backends.md with a version-independent one, with a summary in docs/herdr-backend.md.

Risk Assessment

✅ Low: Every acceptance criterion was independently verified against the code - the portable regression reproduces the defect when only the consumer narrowing is reverted, _fm_composer_pi_separator_row is byte-identical to base, a base-vs-HEAD sweep across 17 fixtures in both locales moved only the three intended titled-rule verdicts, the restored bordered ASCII boundary is pinned in both directions and demonstrably bites, and the tightened UTF-8 proof refuses every malformed class its comment claims - leaving only two wording-accuracy items inside an env-gated developer guard.

Testing

I ran the composer-owner tests and both cursorless adapter suites green (31/33/175/61 ok, matching the branch's own docs record), then proved the change is a real regression fix rather than a passing assertion: reverting only the consumer narrowing makes the new portable test fail on the herdr row while tmux still passes, and reintroducing the earlier attempt's at-end gap fails the flush-at-end fixture. For product-level evidence I drove the real away-mode daemon over the real herdr backend against a real pane rendering Claude's titled composer rule in a throwaway fm-lab-* session - base reader: unknown, inject deferred, nothing submitted; this branch: empty, escalation typed and submitted; and a human draft in the same composer still pending so away mode defers. I also reproduced the docs record's real-capture counterfactual against a live claude pane read-only (163 columns, non-ASCII title, unknown→empty in both locales), showed the base commit's own test file still passes against the new reader, and showed the bordered ASCII-only injection boundary and the plain-vs-titled parity are unchanged. Visual evidence: no browser or screenshot tool exists on this host (no chromium/wkhtmltoimage/PIL, and installing one would breach the worktree boundary), so I rendered the captured pane surface, verdicts and delivery outcome into a self-contained SVG/HTML artifact built verbatim from the two transcripts. The only failures anywhere were the live guard's claude and codex tmux-launch sections hitting each vendor's folder-trust dialog in this gate worktree - pre-existing, environmental, in code this branch does not touch, and documented as expected by the guard itself.

  • Evidence: Visual: away-mode escalation into Claude's titled composer rule, before vs after (rendered SVG/HTML) (local file: /tmp/no-mistakes-evidence/01M004MQF4M9EKB5G0JGHCQZGJ/away-mode-titled-rule.svg)
Evidence: Same visual as standalone HTML page
<!doctype html>
<meta charset="utf-8"><title>Away-mode escalation into a titled composer rule</title>
<body style="background:#14161a;color:#e8eaed;font-family:'DejaVu Sans Mono',monospace;padding:24px">
<h2 style="font-size:16px">Away-mode escalation into Claude&#8217;s titled composer rule</h2>
<p style="color:#8b929e;font-size:12px">Real herdr backend, real bin/fm-supervise-daemon.sh, isolated <code>fm-lab-*</code> session.
The only difference between the two columns is which <code>bin/fm-composer-lib.sh</code> is installed.</p>
<svg xmlns="http://www.w3.org/2000/svg" width="1268" height="431" viewBox="0 0 1268 431">
<style>
  text { font-family: "DejaVu Sans Mono", "Menlo", monospace; }
  .bg { fill: #14161a; }
  .panel { fill: #1c1f26; stroke-width: 2; rx: 8; }
  .grid { fill: #0d0f13; stroke: #2b2f38; stroke-width: 1; rx: 4; }
  .h { font-size: 15px; font-weight: bold; fill: #e8eaed; }
  .sub { font-size: 11px; fill: #8b929e; }
  .lbl { font-size: 11px; fill: #8b929e; }
  .term { font-size: 13px; fill: #cfd4dc; }
  .verdict-ok { font-size: 13px; fill: #6fd08c; }
  .verdict-bad { font-size: 13px; fill: #ff8a7a; }
  .res-ok { font-size: 13px; font-weight: bold; fill: #3fa45b; }
  .res-bad { font-size: 13px; font-weight: bold; fill: #e0574a; }
  .cap { font-size: 13px; fill: #e8eaed; }
  .cap2 { font-size: 11px; fill: #8b929e; }
</style>
<rect class="bg" x="0" y="0" width="1268" height="431"/>
<text class="cap" x="4" y="20">Away-mode escalation into Claude&#8217;s titled composer rule &#8212; real herdr backend, real fm-supervise-daemon.sh, isolated fm-lab session</text>
<text class="cap2" x="4" y="38">The only difference between the two panels is which bin/fm-composer-lib.sh is installed. Pane content, verdicts and result lines are verbatim from away-mode-&#123;before,after&#125;-fix.txt.</text>
<g transform="translate(0,52)"><g transform="translate(0,0)"><rect x="0" y="0" width="620" height="347" class="panel" stroke="#e0574a"/><rect x="10" y="64" width="600" height="91" class="grid"/><text x="18" y="19" class="h">BEFORE — base 6789876</text><text x="18" y="35" class="sub">blob 3db598d68bf8 = base 6789876 bin/fm-composer-lib.sh</text><text x="18" y="41" class="sub"></text><text x="18" y="60" class="lbl">the supervisor pane, as herdr captured it:</text><text x="18" y="81" class="term">transcript line: opening the review deck</text><text x="18" y="98" class="term">──────────── ✳ Review demo ─────────────</text><text x="18" y="115" class="term">❯</text><text x="18" y="132" class="term">────────────────────────────────────────</text><text x="18" y="149" class="term">  bypass permissions on</text><text x="18" y="178" class="lbl">away-mode composer guard:</text><text x="18" y="197" class="verdict-bad">fm_backend_composer_state herdr &lt;pane&gt; -&gt; unknown</text><text x="18" y="222" class="lbl">daemon log:</text><text x="18" y="241" class="term">inject deferred: supervisor composer not confirmed-empty (state=un</text><text x="18" y="260" class="term">known: pending input, dead-shell prompt, or unreadable pane)</text><text x="18" y="279" class="lbl">what the pane received:</text><text x="18" y="298" class="term">(nothing submitted)</text><text x="18" y="329" class="res-bad">escalation NOT delivered - away mode deferred it silently (composer guard read unknown)</text></g><g transform="translate(648,0)"><rect x="0" y="0" width="620" height="309" class="panel" stroke="#3fa45b"/><rect x="10" y="64" width="600" height="91" class="grid"/><text x="18" y="19" class="h">AFTER — this branch</text><text x="18" y="35" class="sub">blob 33405eb5fef2 = this branch 7585135 bin/fm-composer-lib.sh</text><text x="18" y="41" class="sub"></text><text x="18" y="60" class="lbl">the supervisor pane, as herdr captured it:</text><text x="18" y="81" class="term">transcript line: opening the review deck</text><text x="18" y="98" class="term">──────────── ✳ Review demo ─────────────</text><text x="18" y="115" class="term">❯</text><text x="18" y="132" class="term">────────────────────────────────────────</text><text x="18" y="149" class="term">  bypass permissions on</text><text x="18" y="178" class="lbl">away-mode composer guard:</text><text x="18" y="197" class="verdict-ok">fm_backend_composer_state herdr &lt;pane&gt; -&gt; empty</text><text x="18" y="222" class="lbl">what the pane received:</text><text x="18" y="241" class="term">⁣FIRSTMATE_OP: v1 away-supervisor: Supervisor escalate (1 event(s)…</text><text x="18" y="260" class="term">  ): fake-c1.status: done: PR https://example.test/pr/451 (catch-a</text><text x="18" y="291" class="res-ok">escalation DELIVERED to the titled-rule composer (composer guard read empty)</text></g></g>
</svg>

</body>
Evidence: BEFORE (base 6789876 reader): real away-mode daemon over real herdr, escalation silently deferred

--- what the supervisor pane actually renders (real herdr capture) --- | transcript line: opening the review deck | ──────────── ✳ Review demo ───────────── | ❯ | ──────────────────────────────────────── | bypass permissions on fm_backend_composer_state herdr <pane> -> unknown [..] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane) (x6) --- what the supervisor pane received (submitted lines) --- (nothing submitted) RESULT: escalation NOT delivered - away mode deferred it silently (composer guard read unknown)

===== BEFORE — base commit 6789876 (defect B live) =====
reader installed  : blob 3db598d68bf8 = base 6789876 bin/fm-composer-lib.sh
isolated session  : fm-lab-titledrule-4146810 (never `default`)

--- what the supervisor pane actually renders (real herdr capture) ---
  | transcript line: opening the review deck
  | ──────────── ✳ Review demo ─────────────
  | ❯
  | ────────────────────────────────────────
  |   bypass permissions on

--- the away-mode composer guard ---
fm_backend_composer_state herdr fm-lab-titledrule-4146810:w1:p2 -> unknown

--- a crewmate finishes while the captain is away ---
echo "done: PR https://example.test/pr/451" > $STATE_DIR/fake-c1.status

--- daemon log (away-mode injection decision) ---
  [2026-08-16T17:23:07+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)
  [2026-08-16T17:23:08+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)
  [2026-08-16T17:23:09+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)
  [2026-08-16T17:23:10+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)
  [2026-08-16T17:23:12+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)
  [2026-08-16T17:23:13+0000] inject deferred: supervisor composer not confirmed-empty (state=unknown: pending input, dead-shell prompt, or unreadable pane)

--- what the supervisor pane received (submitted lines) ---
  (nothing submitted)

--- supervisor pane after the escalation window ---
  | transcript line: opening the review deck
  | ──────────── ✳ Review demo ─────────────
  | ❯
  | ────────────────────────────────────────
  |   bypass permissions on

RESULT: escalation NOT delivered - away mode deferred it silently (composer guard read unknown)
Evidence: AFTER (this branch): same pane, same daemon - digest delivered; and a human draft in the same composer still defers

fm_backend_composer_state herdr <pane> -> empty --- what the supervisor pane received (submitted lines) --- ⁣FIRSTMATE_OP: v1 away-supervisor: Supervisor escalate (1 event(s)): fake-c1.status: done: PR https://example.test/pr/451 (catch-all scan) ... injection RESULT: escalation DELIVERED to the titled-rule composer (composer guard read empty) --- a human types a draft into the same titled-rule composer, no Enter --- | ❯ half-typed thought about the deck fm_backend_composer_state herdr <pane> -> pending RESULT: away mode defers on the draft (state=pending), the human keystrokes are safe

===== AFTER — this branch (7585135) =====
reader installed  : blob 33405eb5fef2 = this branch 7585135 bin/fm-composer-lib.sh
isolated session  : fm-lab-titledrule-72466 (never `default`)

--- what the supervisor pane actually renders (real herdr capture) ---
  | transcript line: opening the review deck
  | ──────────── ✳ Review demo ─────────────
  | ❯
  | ────────────────────────────────────────
  |   bypass permissions on

--- the away-mode composer guard ---
fm_backend_composer_state herdr fm-lab-titledrule-72466:w1:p2 -> empty

--- a crewmate finishes while the captain is away ---
echo "done: PR https://example.test/pr/451" > $STATE_DIR/fake-c1.status

--- daemon log (away-mode injection decision) ---
  [2026-08-16T17:31:46+0000] daemon starting (pid 73214); target=fm-lab-titledrule-72466:w1:p2; target_source=FM_SUPERVISOR_TARGET; backend=herdr; backend_source=FM_SUPERVISOR_BACKEND; afk=on; inject_skip='heartbeat'; stale_escalate=999999s; batch=0s
  [2026-08-16T17:31:49+0000] self-handle: signal: /tmp/fm-titledrule-demo.kNNNey/fake-c1.status -> signal already escalated (catch-all scan): fake-c1.status: done: PR https://example.test/pr/451

--- what the supervisor pane received (submitted lines) ---
  ⁣FIRSTMATE_OP: v1 away-supervisor: Supervisor escalate (1 event(s)): fake-c1.status: done: PR https://example.test/pr/451 (catch-all scan) (pre-read; re-arm not needed — watcher daemon-managed)	injection

--- supervisor pane after the escalation window ---
  | transcript line: opening the review deck
  | ──────────── ✳ Review demo ─────────────
  | ❯
  | ────────────────────────────────────────
  |   bypass permissions on

RESULT: escalation DELIVERED to the titled-rule composer (composer guard read empty)

--- a human types a draft into the same titled-rule composer, no Enter ---
  | transcript line: opening the review deck
  | ──────────── ✳ Review demo ─────────────
  | ❯ half-typed thought about the deck
  | ────────────────────────────────────────
  |   bypass permissions on
fm_backend_composer_state herdr <pane> -> pending
RESULT: away mode defers on the draft (state=pending), the human keystrokes are safe
Evidence: Real-capture counterfactual: a live claude pane's own 20-row capture with only the top rule overwritten by its real terminal title

pane : w1:p9 (live default Herdr session, read-only) claude : claude 2.1.233.669 (ASBX Claude Code, channel stable) terminal_title : [⠐ Review interview demo and deck prep] (non-ASCII leading glyph) live verdict now: empty (this build draws a CLEAN rule, so the shape is dormant) top rule row 14, composer row 15, closing rule row 16, 163 columns wide ### base 6789876 reader (before the fix) top=asis cols=163 residue=[] verdict=empty (LC_ALL=C: empty) top=at-end cols=163 residue=[⠐ Review interview demo and deck prep] verdict=unknown (LC_ALL=C: unknown) top=embedded cols=163 residue=[⠐ Review interview demo and deck prep] verdict=unknown (LC_ALL=C: unknown) ### this branch's reader (after the fix) top=asis cols=163 residue=[] verdict=empty (LC_ALL=C: empty) top=at-end cols=163 residue=[⠐ Review interview demo and deck prep] verdict=empty (LC_ALL=C: empty) top=embedded cols=163 residue=[⠐ Review interview demo and deck prep] verdict=empty (LC_ALL=C: empty)

pane            : w1:p9 (live `default` Herdr session, read-only)
claude          : claude 2.1.233.669 (ASBX Claude Code, channel stable)
herdr           : herdr 0.8.0
terminal_title  : [⠐ Review interview demo and deck prep]  (first glyph U+2733, the outage host's own title)
live verdict now: empty   (this build draws a CLEAN rule, so the shape is dormant)

top rule row 14, composer row 15, closing rule row 16, 163 columns wide

### base 6789876 reader (before the fix)
  top=asis      cols=163  residue=[] verdict=empty    (LC_ALL=C: empty)
  top=at-end    cols=163  residue=[⠐ Review interview demo and deck prep] verdict=unknown  (LC_ALL=C: unknown)
  top=embedded  cols=163  residue=[⠐ Review interview demo and deck prep] verdict=unknown  (LC_ALL=C: unknown)

### this branch's reader (after the fix)
  top=asis      cols=163  residue=[] verdict=empty    (LC_ALL=C: empty)
  top=at-end    cols=163  residue=[⠐ Review interview demo and deck prep] verdict=empty    (LC_ALL=C: empty)
  top=embedded  cols=163  residue=[⠐ Review interview demo and deck prep] verdict=empty    (LC_ALL=C: empty)
Evidence: Regression proof: revert ONLY the consumer narrowing -> the new portable test fails

not ok - claude titled-rule idle on herdr: expected empty, got 'unknown' (the tmux row above it still passes, matching the claim that only the cursorless profiles regressed)

ok - fm_composer_classify_content: a bare shell prompt glyph (>/$/%/#) reads unknown, never empty
ok - fm_composer_classify_content: stripped unbordered content is unknown except verified agent glyphs
ok - fm_composer_classify_content: a bare shell prompt carrying a command is not empty
ok - fm_composer_classify_content: a bare prompt glyph inside a bordered composer box reads empty (claude's own idle composer)
ok - fm_composer_classify_content: agent prompt glyphs (❯ claude, › codex, ⟩ muse) read empty bordered or bare
ok - fm_composer_classify_content: an empty composer reads empty
ok - fm_composer_classify_content: idle matching is limited to proven placeholder positions
ok - fm_composer_classify_content: idle matching preserves the caller's case mode
ok - fm_composer_classify_content: real unsubmitted text reads pending (including a popup argument-hint fill)
ok - matrix: claude's ❯+NBSP row reads empty on every profile in both locales (#1988)
ok - matrix: codex's dim hint is empty when styling proves it, unknown (never pending) when it cannot
ok - matrix: muse's ⟩ reads empty everywhere and survives losing the styled-glyph signal
ok - matrix: cursor's reverse-video placeholder remnant reads empty; real typed text stays pending
ok - matrix: herdr half-block rules bound a bare composer's wrap region
ok - matrix: pi's separated composer needs identity + structure; the blank row alone never proves it
ok - matrix: opencode's left-bar composer reads empty everywhere and scans the full active run
ok - matrix: grok's titled bottom border is tolerated as a title, not read as ambiguity
ok - matrix: kimi's bordered shell-glyph box reads empty through the shared owner (spawn's fourth copy retired)
ok - matrix: the real claude-in-zellij --ansi dump reads empty in both locales
ok - strict posture: blank and unidentified rows are unknown, never injectable empty
ok - fm_composer_classify_screen: the bare composer's wrap region stays identified; structure breaks it
ok - fm_composer_classify_screen: a row-leading agent glyph reanchors the live composer
ok - fm_composer_classify_screen: a lower dead shell invalidates only cursorless stale composers
ok - fm_composer_classify_screen: cursorless bare wrap regions participate in verdicts
ok - fm_composer_classify_screen: cursorless containers reject only contiguous unclaimed activity
ok - fm_composer_classify_screen: the bottom-most candidate wins; stale banners cannot
ok - fm_composer_classify_screen: incomplete lower structure invalidates stale boxes
ok - fm_composer_classify_screen: titled bottoms retain full box geometry
not ok - claude titled-rule idle on herdr: expected empty, got 'unknown'
Evidence: At-end gap proof: reintroduce the earlier attempt's "row must end in a dash" rule -> the flush-at-end fixture fails

not ok - titled rule '─────────────────────────────Review demo' must read as a rule at its partner's width

ok - fm_composer_classify_content: a bare shell prompt glyph (>/$/%/#) reads unknown, never empty
ok - fm_composer_classify_content: stripped unbordered content is unknown except verified agent glyphs
ok - fm_composer_classify_content: a bare shell prompt carrying a command is not empty
ok - fm_composer_classify_content: a bare prompt glyph inside a bordered composer box reads empty (claude's own idle composer)
ok - fm_composer_classify_content: agent prompt glyphs (❯ claude, › codex, ⟩ muse) read empty bordered or bare
ok - fm_composer_classify_content: an empty composer reads empty
ok - fm_composer_classify_content: idle matching is limited to proven placeholder positions
ok - fm_composer_classify_content: idle matching preserves the caller's case mode
ok - fm_composer_classify_content: real unsubmitted text reads pending (including a popup argument-hint fill)
ok - matrix: claude's ❯+NBSP row reads empty on every profile in both locales (#1988)
ok - matrix: codex's dim hint is empty when styling proves it, unknown (never pending) when it cannot
ok - matrix: muse's ⟩ reads empty everywhere and survives losing the styled-glyph signal
ok - matrix: cursor's reverse-video placeholder remnant reads empty; real typed text stays pending
ok - matrix: herdr half-block rules bound a bare composer's wrap region
ok - matrix: pi's separated composer needs identity + structure; the blank row alone never proves it
ok - matrix: opencode's left-bar composer reads empty everywhere and scans the full active run
ok - matrix: grok's titled bottom border is tolerated as a title, not read as ambiguity
ok - matrix: kimi's bordered shell-glyph box reads empty through the shared owner (spawn's fourth copy retired)
ok - matrix: the real claude-in-zellij --ansi dump reads empty in both locales
ok - strict posture: blank and unidentified rows are unknown, never injectable empty
ok - fm_composer_classify_screen: the bare composer's wrap region stays identified; structure breaks it
ok - fm_composer_classify_screen: a row-leading agent glyph reanchors the live composer
ok - fm_composer_classify_screen: a lower dead shell invalidates only cursorless stale composers
ok - fm_composer_classify_screen: cursorless bare wrap regions participate in verdicts
ok - fm_composer_classify_screen: cursorless containers reject only contiguous unclaimed activity
ok - fm_composer_classify_screen: the bottom-most candidate wins; stale banners cannot
ok - fm_composer_classify_screen: incomplete lower structure invalidates stale boxes
ok - fm_composer_classify_screen: titled bottoms retain full box geometry
not ok - titled rule '─────────────────────────────Review demo' must read as a rule at its partner's width
Evidence: No pinned verdict moved: the BASE commit's own composer test file run against this branch's reader (30 ok, 0 not ok)
# base commit 6789876's OWN composer-owner test file, run against THIS BRANCH's bin/fm-composer-lib.sh
# every verdict pinned before this change must still hold - that is the no-regression proof for the consolidation
ok - fm_composer_classify_content: a bare shell prompt glyph (>/$/%/#) reads unknown, never empty
ok - fm_composer_classify_content: stripped unbordered content is unknown except verified agent glyphs
ok - fm_composer_classify_content: a bare shell prompt carrying a command is not empty
ok - fm_composer_classify_content: a bare prompt glyph inside a bordered composer box reads empty (claude's own idle composer)
ok - fm_composer_classify_content: agent prompt glyphs (❯ claude, › codex, ⟩ muse) read empty bordered or bare
ok - fm_composer_classify_content: an empty composer reads empty
ok - fm_composer_classify_content: idle matching is limited to proven placeholder positions
ok - fm_composer_classify_content: idle matching preserves the caller's case mode
ok - fm_composer_classify_content: real unsubmitted text reads pending (including a popup argument-hint fill)
ok - matrix: claude's ❯+NBSP row reads empty on every profile in both locales (#1988)
ok - matrix: codex's dim hint is empty when styling proves it, unknown (never pending) when it cannot
ok - matrix: muse's ⟩ reads empty everywhere and survives losing the styled-glyph signal
ok - matrix: cursor's reverse-video placeholder remnant reads empty; real typed text stays pending
ok - matrix: herdr half-block rules bound a bare composer's wrap region
ok - matrix: pi's separated composer needs identity + structure; the blank row alone never proves it
ok - matrix: opencode's left-bar composer reads empty everywhere and scans the full active run
ok - matrix: grok's titled bottom border is tolerated as a title, not read as ambiguity
ok - matrix: kimi's bordered shell-glyph box reads empty through the shared owner (spawn's fourth copy retired)
ok - matrix: the real claude-in-zellij --ansi dump reads empty in both locales
ok - strict posture: blank and unidentified rows are unknown, never injectable empty
ok - fm_composer_classify_screen: the bare composer's wrap region stays identified; structure breaks it
ok - fm_composer_classify_screen: a row-leading agent glyph reanchors the live composer
ok - fm_composer_classify_screen: a lower dead shell invalidates only cursorless stale composers
ok - fm_composer_classify_screen: cursorless bare wrap regions participate in verdicts
ok - fm_composer_classify_screen: cursorless containers reject only contiguous unclaimed activity
ok - fm_composer_classify_screen: the bottom-most candidate wins; stale banners cannot
ok - fm_composer_classify_screen: incomplete lower structure invalidates stale boxes
ok - fm_composer_classify_screen: titled bottoms retain full box geometry
ok - fm_composer_classify_screen: a proven box tolerates a bottom-border cursor
ok - fm_composer_extract_selected_content: scopes user content and excludes furniture
exit=0
Evidence: Bordered ASCII-only boundary unmoved: base vs branch accept/refuse differential for fm_composer_geometry_spaces and _fm_composer_titled_bottom_ok (0 diffs, both locales)
=== fm_composer_geometry_spaces (bordered box content-row blankness) ===
# accept = the row is provably blank to its border width, so the box may read `empty`

- ASCII printables
  same   C.UTF-8 base=accept branch=accept [ ]
  same   C    base=accept branch=accept [ ]
  => ASCII printables: base and branch AGREE, byte for byte, in both locales

- ASCII whitespace incl. tab
  same   C.UTF-8 base=accept branch=accept [ \t ]
  same   C    base=accept branch=accept [ \t ]
  => ASCII whitespace incl. tab: base and branch AGREE, byte for byte, in both locales

- normalised NO-BREAK SPACE
  same   C.UTF-8 base=accept branch=accept [ ]
  same   C    base=accept branch=accept [ ]
  => normalised NO-BREAK SPACE: base and branch AGREE, byte for byte, in both locales

- empty row
  same   C.UTF-8 base=accept branch=accept []
  same   C    base=accept branch=accept []
  => empty row: base and branch AGREE, byte for byte, in both locales

- prompt glyph + NBSP
  same   C.UTF-8 base=accept branch=accept [ ]
  same   C    base=accept branch=accept [ ]
  => prompt glyph + NBSP: base and branch AGREE, byte for byte, in both locales

- prompt glyph + ASCII
  same   C.UTF-8 base=accept branch=accept [ ]
  same   C    base=accept branch=accept [ ]
  => prompt glyph + ASCII: base and branch AGREE, byte for byte, in both locales

- accented (non-ASCII)
  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => accented (non-ASCII): base and branch AGREE, byte for byte, in both locales

- Cyrillic (non-ASCII)
  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => Cyrillic (non-ASCII): base and branch AGREE, byte for byte, in both locales

- CJK (double width)
  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => CJK (double width): base and branch AGREE, byte for byte, in both locales

- box-drawing (another container's edge)
  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => box-drawing (another container's edge): base and branch AGREE, byte for byte, in both locales

- ESC control byte
  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => ESC control byte: base and branch AGREE, byte for byte, in both locales

=== _fm_composer_titled_bottom_ok (grok's titled bottom border) ===
# args: <family> <bottom-inner> <top-spaces>; accept = the mismatched bottom
# border is a legitimate TITLE at the top border width, so the box still reads `empty`

  same   C.UTF-8 base=accept branch=accept []
  same   C    base=accept branch=accept []
  => plain 40-col bottom border: base and branch AGREE, byte for byte, in both locales

  same   C.UTF-8 base=accept branch=accept []
  same   C    base=accept branch=accept []
  => ASCII title, 40 columns: base and branch AGREE, byte for byte, in both locales

  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => non-ASCII title, 40 columns: base and branch AGREE, byte for byte, in both locales

  same   C.UTF-8 base=REFUSE branch=REFUSE REFUSE
  same   C    base=REFUSE branch=REFUSE REFUSE
  => ASCII title, wrong width: base and branch AGREE, byte for byte, in both locales
Evidence: Parity probe: a titled rule earns exactly what a plain rule already earned, never more

- idle composer, footer below the closing rule (the real Claude shape) herdr base: plain=empty titled=unknown | branch: plain=empty titled=empty titled == plain cmux/orca base: plain=empty titled=unknown | branch: plain=empty titled=empty titled == plain - a dead SHELL glyph in the same sandwich herdr base: plain=unknown titled=unknown | branch: plain=unknown titled=unknown titled == plain - a BLANK row in the same sandwich cmux/orca base: plain=unknown titled=unknown | branch: plain=unknown titled=unknown titled == plain

=== does a titled rule ever earn MORE than a plain rule earns? ===
# `empty` is the only verdict that authorizes away mode to type into a pane.

- idle composer, footer below the closing rule (the real Claude shape)
  herdr     base: plain=empty    titled=unknown  | branch: plain=empty    titled=empty     titled == plain
  cmux/orca base: plain=empty    titled=unknown  | branch: plain=empty    titled=empty     titled == plain
  (the shape the outage was about)

- composer block with newer transcript BELOW its closing rule
  herdr     base: plain=empty    titled=unknown  | branch: plain=empty    titled=empty     titled == plain
  cmux/orca base: plain=empty    titled=unknown  | branch: plain=empty    titled=empty     titled == plain
  (a stale on-screen block: titled must not out-earn plain)

- glyph separated from the closing rule by a transcript row
  herdr     base: plain=pending  titled=unknown  | branch: plain=pending  titled=unknown   titled != plain
  cmux/orca base: plain=unknown  titled=unknown  | branch: plain=unknown  titled=unknown   titled == plain
  (adjacency broken on the bottom edge)

- a dead SHELL glyph in the same sandwich
  herdr     base: plain=unknown  titled=unknown  | branch: plain=unknown  titled=unknown   titled == plain
  cmux/orca base: plain=unknown  titled=unknown  | branch: plain=unknown  titled=unknown   titled == plain
  (the dead-shell rule is untouched)

- a BLANK row in the same sandwich (identity reports claude, not pi)
  herdr     base: plain=unknown  titled=unknown  | branch: plain=unknown  titled=unknown   titled == plain
  cmux/orca base: plain=unknown  titled=unknown  | branch: plain=unknown  titled=unknown   titled == plain
  (the strict blank-row posture is untouched)
Evidence: Env-gated live guard run (FM_COMPOSER_MATRIX_LIVE=1): new herdr section read 5 live idle claude panes; reports the titled shape absent on this build rather than passing vacuously
# claude pane tail at failure:
#    Accessing workspace:
#    /local/home/inthuson/.no-mistakes/worktrees/d4c7ad84348d/01M004MQF4M9EKB5G0JGHCQZGJ
#    Quick safety check: Is this a project you created or one you trust? (Like your own code, a well-known open source project, or work from your team). If not, take a moment to review what's in this folder first.
#    Claude Code'll be able to read, edit, and execute files here.
#    Security guide
#    ❯ 1. Yes, I trust this folder
#      2. No, exit
#    Enter to confirm · Esc to cancel
not ok - claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle composer never classified empty (last verdict: pending)
# codex pane tail at failure:
#                      `` ``               
#     Welcome to Codex, OpenAI's command-line coding agent
#   > You are in /local/home/inthuson/.no-mistakes/worktrees/d4c7ad84348d/01M004MQF4M9EKB5G0JGHCQZGJ
#     Note: You’re in a subdirectory of a Git project. Trusting will apply to the repository root: /local/home/inthuson/.no-mistakes/repos
#     Do you trust the contents of this directory? Working with untrusted contents comes with higher risk of prompt injection. Trusting the directory allows project-local config, hooks, and exec policies to load.
#   › 1. Yes, continue
#     2. No, quit
#     Press enter to continue
not ok - codex (0.146.1.356 (stable)): idle composer never classified empty (last verdict: unknown)
# harness absent, not verified here: opencode
# harness absent, not verified here: pi
# harness absent, not verified here: grok
# harness absent, not verified here: kimi
# harness absent, not verified here: muse
ok - strict posture live: a blank shell row classifies unknown and injection defers
# harness absent, not verified here: zellij (false-positive regression not exercised)
ok - herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle pane w11:p2 (focused=false) composer row is blank and classifies empty
ok - herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle pane w12:p2 (focused=false) composer row is blank and classifies empty
ok - herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle pane w13:p2 (focused=false) composer row is blank and classifies empty
ok - herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle pane w14:p2 (focused=false) composer row is blank and classifies empty
ok - herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)): idle pane w15:p2 (focused=false) composer row is blank and classifies empty
# herdr (herdr 0.8.0) + claude (claude 2.1.233.669 (ASBX Claude Code, channel stable)) read NO titled composer rule live: of 6 claude composer pane(s) examined, 6 carried a rule directly below the composer row, 6 of those drew a plain rule, and 0 drew a titled rule declined on a documented boundary (noted above); the titled-rule regression was NOT exercised live here and rests on the portable regression in tests/fm-composer-lib.test.sh
not ok - live composer-matrix guard observed failures above
Evidence: Evidence index (what each file proves, host/version context)
# Test evidence — defect B: a titled composer rule discarding a live Claude composer

Branch `fm/composer-titled-rule-t4` @ `7585135`, base `6789876`.
Host: Linux x86_64, `herdr 0.8.0`, `claude 2.1.233.669 (ASBX Claude Code, channel stable)`,
tmux 3.6a, bash 5.2, `LANG=C.UTF-8`. Every verdict below was taken in both
`C.UTF-8` and `LC_ALL=C`.

## The end-user experience, before and after

| file | what it shows |
|---|---|
| `away-mode-titled-rule.svg` / `.html` | **visual**: the two transcripts below rendered side by side — the real pane, the composer guard's verdict, and whether the escalation was delivered |
| `away-mode-before-fix.txt` | base reader installed: real `fm-supervise-daemon.sh` over the real herdr backend, against a real pane rendering Claude's titled composer rule → guard reads `unknown`, daemon logs `inject deferred: supervisor composer not confirmed-empty`, **nothing submitted** |
| `away-mode-after-fix.txt` | this branch's reader, same pane and same daemon → guard reads `empty`, the away-supervisor digest is **typed and submitted** into the composer. Its last section types a human draft into that same titled-rule composer with no Enter: the guard reads `pending`, so away mode defers and the keystrokes are not clobbered |
| `away-mode-titled-rule-demo.sh` | the harness that produced both, in a throwaway `fm-lab-*` Herdr session (`bin/fm-herdr-lab.sh` refuses `default`); torn down after each run |

## The real-capture counterfactual (the portable regression's live twin)

| file | what it shows |
|---|---|
| `real-capture-counterfactual.txt` | a live claude pane out of the operator's `default` session (read-only), its own 20-row capture rebuilt with ONLY the top rule's dashes overwritten by that pane's actual terminal title (163 columns, leading glyph non-ASCII) → base: `unknown`, branch: `empty`; the clean-rule case unchanged at `empty`; both locales |
| `real-capture-{asis,at-end,embedded}.txt` | the three captures classified, byte for byte |
| `real-capture-counterfactual.sh`, `classify-one.sh` | the harness; classification goes through the exact capability descriptor `bin/backends/herdr.sh` builds |

## The regression is a regression (fails before the fix)

| file | what it shows |
|---|---|
| `composer-lib-portable.txt` | `tests/fm-composer-lib.test.sh` green on this branch (31 ok) |
| `counterfactual-consumer-reverted.txt` | with ONLY the consumer narrowing in `_fm_composer_select_cursorless` reverted: `not ok - claude titled-rule idle on herdr: expected empty, got 'unknown'` — and the tmux row still passes, matching the claim that only the cursorless profiles regressed |
| `counterfactual-at-end-gap.txt` | with the earlier attempt's at-end gap reintroduced (only a row *ending* in a dash counted as a titled rule): `not ok - titled rule '─…─Review demo' must read as a rule at its partner's width` |

## Nothing else moved

| file | what it shows |
|---|---|
| `base-tests-against-branch-lib.txt` | the **base commit's own** `tests/fm-composer-lib.test.sh` run against this branch's `bin/fm-composer-lib.sh`: 30 ok, 0 not ok — every verdict pinned before this change still holds |
| `bordered-boundary-differential.txt` | `fm_composer_geometry_spaces` and `_fm_composer_titled_bottom_ok` accept/refuse identically under base and branch across ASCII, tab, NBSP, empty, prompt-glyph, accented, Cyrillic, CJK, box-drawing and ESC inputs, in both locales — the ASCII-only bordered boundary that authorizes injection did not move |
| `parity-plain-vs-titled.txt` | a titled rule now earns exactly what a plain rule already earned and never more: composer shapes reach `empty` (parity), while a dead shell, a blank row, and a glyph whose adjacency is broken stay `unknown` |
| `composer-ghost.txt`, `adapter-herdr.txt`, `adapter-cmux.txt` | the sibling owner test (33 ok) and the two cursorless adapters that consume the classifier (175 ok, 61 ok) |

## The env-gated live guard

`live-composer-matrix-guard.txt` — `FM_COMPOSER_MATRIX_LIVE=1 tests/fm-composer-matrix-live-e2e.test.sh`.

The new herdr section read 5 live idle claude panes through the shared classifier
and each one's own composer row (all blank → `empty`), and reported honestly that
no pane renders a titled rule on this Claude build, so the shape rests on the
portable regression. It did **not** convert that absence into a pass.

Its two `not ok` lines come from sections this branch does not touch: launching
`claude` and `codex` in the isolated tmux server from this gate worktree opens each
vendor's first-launch **folder-trust dialog**, which the strict classifier correctly
refuses to call a composer. The guard's own header documents that as the expected
outcome in an untrusted cwd. Trusting the folder would mean writing to a vendor
config outside this worktree, so it was left alone.
- Outcome: ⚠️ 2 issues (1 warning, 1 info) across 1 run (19m42s)

Pipeline

Updates from git push no-mistakes

... (6 earlier update rounds omitted to keep the PR body within GitHub's 65536-char limit; full history is in the run log.)

⚠️ **Review** - 2 infos

🔧 Fix: fail exact-width live mismatches; narrow idle-pane read race
2 issues (1 warning, 1 info) still open:

  • ⚠️ tests/fm-composer-matrix-live-e2e.test.sh:550 - The new race-skip branch discards the verdict wholesale, so it excuses the two verdicts the same commit promises always fail. elif [ &#34;$hd_accept&#34; = empty ] &amp;&amp; ! hd_composer_row_blank &#34;default:$hd_pane&#34; is reached for ANY unmet blank expectation, including hd_verdict=unknown and an unreadable (empty) verdict. That directly contradicts this loop's own comment at lines 493-496 ("What is never accepted, in both cases, is unknown or an unreadable verdict on a composer this loop can see - the defect that deferred every away-mode escalation, and the whole reason this guard exists") and the sentence this change added to docs/verification/runtime-backends.md:272 ("unknown and an unreadable verdict fail in both cases, which is the behaviour the guard exists to catch"). Concrete sequence: an idle pane's composer row is blank in the first capture, so hd_accept=&#39;empty&#39;; the classifier returns unknown for a reason no documented boundary explains (I verified hd_rule_refusal_reason correctly returns empty for an ASCII-titled width mismatch and for a structural glyph, so hd_documented_unknown declines and the first elif is false); the operator types a character before hd_composer_row_blank re-reads, so it returns 1, and the pane is noted as a race with FAILED untouched. The verdict unknown was never something a keystroke can legitimately produce - typing on a herdr styled capture yields pending - so the race does not explain it and it should still fail. A second, narrower path reaches the same skip with no race at all: hd_composer_row_blank returns 1 when fm_backend_herdr_capture fails or when the re-read finds no agent glyph row (lines 286 and 299), so a transient capture hiccup alone downgrades a live unknown to a skip. Mitigation that keeps this at warning rather than error: the titled loop above scans every claude pane and fails independently on an ASCII-titled width mismatch, so the headline shape still trips FAILED through that path. Minimal fix that stays inside the authorized posture: keep the race skip only for pending and pending-unproven (the verdicts a keystroke can legitimately produce), and continue to FAIL on unknown or an unreadable verdict regardless of what the re-read shows; and distinguish "re-read unreadable" from "row is no longer blank" so the note's reason is the one it claims.
  • ℹ️ bin/fm-composer-lib.sh:150 - The comment on FM_COMPOSER_STRUCTURAL_LEADS claims "This is a superset of every glyph fm_composer_row_has_edge treats as structural", but that is false for the two ASCII edges. fm_composer_row_has_edge (line 912) treats | and + as structural, and neither is in U+2500..U+25FF, so fm_composer_column_spaces pass 1 does not reject them - they fall through to pass 3 and are credited with one column each. The Unicode half of the claim checks out: I verified the four lead pairs E2 94/95/96/97 cover exactly U+2500..U+25FF, which contains every box-drawing (│┃║╭╮┌┐╔╗┏┓╰╯└┘╚╝┗┛─━═) and block (▀▄▁▔) glyph in that predicate, and that E2 can never appear as a UTF-8 continuation byte so the two-byte prefix test cannot false-positive. There is no behaviour defect: crediting an ASCII | in a title with one column is correct (it occupies one), and base's ASCII pass did exactly the same, so nothing moved. The problem is only that a load-bearing safety comment in the file whose comments the last three rounds were spent correcting now overstates the rejection's reach, which is how a future maintainer concludes an ASCII-bordered container's edge is caught here when it is not. Narrow the sentence to what the set proves: every box-drawing, block, and geometric glyph in U+2500..U+25FF, which is every NON-ASCII glyph that predicate treats as structural.

🔧 Fix: gate live race skip on draft verdicts; narrow structural claim
2 infos still open:

  • ℹ️ tests/fm-composer-matrix-live-e2e.test.sh:510 - The idle loop's comment (lines 509-512) and docs/verification/runtime-backends.md:279 both claim without qualification that unknown and an unreadable verdict always fail ("What is never accepted, in both cases..." / "fail in both cases"). The elif at lines 562-565 does the opposite: when hd_documented_unknown supplies a reason, the pane is noted and FAILED is untouched. I confirmed that path is reachable - hd_documented_unknown returns a reason for a non-ASCII-title width mismatch, a title preceding the opening dash run, and the single-row adjacency limit. Round 5's new sentence at docs line 274 is correctly scoped to the race allowance; line 279 and this comment are the unscoped copies. Qualify both to "unknown with no documented boundary reason".
  • ℹ️ tests/fm-composer-matrix-live-e2e.test.sh:607 - hd_failed is incremented only by the titled loop's two failure paths (lines 457, 469); the idle loop's failure paths at 577 and 586 set FAILED but not hd_failed. Concrete path: Claude restyles so the closing rule also carries text, the titled loop skips the pane at line 429 without counting it, the idle loop fails it with unknown and no documented reason, and the elif at 606 still prints "the titled-rule regression was NOT exercised live here" in the same run that failed on that shape. This is the residue of the round-3 finding that round 4 fixed only for the titled loop. The run still exits non-zero via line 617, so the impact is a misleading line rather than a false pass. Either increment the same counter on the idle loop's failure paths or gate the "NOT exercised" wording on FAILED -eq 0.
⚠️ **Test** - 2 issues (1 warning, 1 info)
  • ⚠️ tests/fm-composer-matrix-live-e2e.test.sh:123 - FM_COMPOSER_MATRIX_LIVE=1 tests/fm-composer-matrix-live-e2e.test.sh exits non-zero here, but both failures are in sections this branch does not touch: launching claude and codex in the guard's isolated tmux server with the gate worktree as cwd opens each vendor's first-launch folder-trust dialog, which the strict classifier correctly refuses to call a composer (last verdict: pending / unknown, with the trust prompt visible in the guard's own pane dump). The guard's header documents a trust dialog as the expected failure in an untrusted cwd, and the branch's own docs record already lists codex as unverified for exactly this reason. Not fixable from inside the worktree - it would mean writing trust state into vendor config outside it. The new herdr section that this change adds passed: 5 live idle claude panes classified empty against their own composer rows, and the absent titled rule was reported as absent rather than as a pass.
  • ℹ️ tests/fm-composer-matrix-live-e2e.test.sh:418 - One branch of the new live idle-pane check could not be exercised live: the guard scans the operator's default Herdr session, and its draft-tolerant direction (accepting pending for an idle pane whose operator typed and did not submit) only fires when a live pane carries an unsubmitted draft. Forcing that would mean typing into the captain's own panes, which is not a safe validation action, so all 5 live panes exercised the blank-row direction. I covered the behaviour that branch depends on instead on a real pane in an isolated fm-lab-* session: a human draft in the titled-rule composer classifies pending, so away mode defers rather than typing over the keystrokes (see away-mode-after-fix.txt).
  • tests/fm-composer-lib.test.sh (31 ok, includes the new test_matrix_claude_titled_composer_rule)
  • tests/fm-composer-ghost.test.sh (33 ok)
  • tests/fm-backend-herdr.test.sh (175 ok) and tests/fm-backend-cmux.test.sh (61 ok) - the cursorless adapters that consume the classifier
  • Counterfactual: reverted ONLY the _fm_composer_bare_rule_sandwich sparing in _fm_composer_select_cursorless, re-ran tests/fm-composer-lib.test.sh -> not ok - claude titled-rule idle on herdr: expected empty, got &#39;unknown&#39;; source restored and worktree verified clean
  • Counterfactual: reintroduced the earlier attempt's at-end gap (case &#34;$row&#34; in *─) ;; *) return 1) in _fm_composer_rule_row -> not ok - titled rule &#39;─…─Review demo&#39; must read as a rule at its partner&#39;s width; source restored
  • No-regression differential: ran the base commit's own tests/fm-composer-lib.test.sh against this branch's bin/fm-composer-lib.sh (30 ok, 0 not ok)
  • Real-capture counterfactual: bash real-capture-counterfactual.sh - read-only pane list + pane capture on the live default Herdr session, rebuilt pane w1:p9's own capture with only the top rule's dashes overwritten by its real terminal title (at-end and embedded), classified under base and branch readers through the herdr ANSI capability descriptor in C.UTF-8 and LC_ALL=C
  • End-to-end away mode: bash away-mode-titled-rule-demo.sh - isolated fm-lab-titledrule-* Herdr session via bin/fm-herdr-lab.sh, a pane rendering Claude's titled composer rule, real bin/fm-supervise-daemon.sh with FM_SUPERVISOR_BACKEND=herdr, a crewmate status file to trigger an escalation; run once with the branch reader and once with the base reader swapped in (then restored)
  • Real-pane draft check: typed an unsubmitted draft into the same titled-rule composer and read fm_backend_herdr_composer_state -> pending (away mode defers)
  • Preserved bordered boundary: bash bordered-boundary-differential.sh - base vs branch accept/refuse for fm_composer_geometry_spaces and _fm_composer_titled_bottom_ok across ASCII, tab, NBSP, empty, prompt-glyph, accented, Cyrillic, CJK, box-drawing and ESC inputs, both locales (0 diffs)
  • Parity probe: bash parity-plain-vs-titled.sh - every fixture classified with a plain top rule and with the same row titled, under base and branch, on the herdr and cmux/orca capability profiles
  • FM_COMPOSER_MATRIX_LIVE=1 tests/fm-composer-matrix-live-e2e.test.sh (env-gated live guard)
  • Cleanup verification: git status --porcelain empty, herdr session list shows only default, no leftover lab tripwires or temp dirs
⚠️ **Document** - 2 infos
  • ℹ️ docs/verification/runtime-backends.md:244 - Intent-vs-code divergence I documented as-landed rather than resolved: the intent lists "ASCII-printable-only title text" as a deliberate constraint and says a non-ASCII title glyph must leave the verdict unknown, but review commit a00ae2e widened _fm_composer_rule_row to read titles of any well-formed single-width script, so the U+2733 title from the outage host now reads empty and tests/fm-composer-lib.test.sh pins that. The verification record and code comments now assert the wider boundary as the guarantee. If the ASCII-only constraint is the binding one, the code, its tests, and this record all have to move together - that is a behavior change outside this documentation phase.
  • ℹ️ docs/verification/runtime-backends.md:264 - Out-of-scope consolidation worth a follow-up: the repository has no in-tree owner for its set of pre-existing failing test files. This record leaned on "the pre-existing failures recorded for this repository", which resolves to nothing tracked (I reduced it to the durable fact instead: the orca/zellij teardown-family failure is byte-identical with the composer narrowing reverted). Every branch that touches these suites re-argues the same point in its own prose. A single maintainer-verification record of the known-failing set, refreshed by one command, would give those sentences an owner to point at.
⚠️ **Lint** - 1 warning
  • ⚠️ linter found issues (exit code 127)
✅ **Push** - passed

✅ No issues found.

…poser

Claude draws its borderless composer between two horizontal `─` rules. When a
terminal-title overlay is burned into the TOP rule, that rule is dashes PLUS
text and fails the dashes-only separator predicate. The separated pair never
opens, so the composer's own BOTTOM rule becomes an unmatched separator sitting
below the `❯` row the scan had already matched. The cursorless staleness rule
reads an unmatched separator below a candidate as proof the candidate is
scrollback, discards the correct match, and returns `unknown` - which defers
away-mode escalation indefinitely and silently. This host paid one 8.5-hour
undelivered-escalation outage for it.

Narrow the consumer rather than loosen the predicate: the dashes-only separator
test also feeds the pi identity conjunction, where being wrong about what closes
a separated composer would promote an unidentified blank region into an injection
target. It is left strictly as-is. Instead the staleness invalidation now spares
a bare agent glyph immediately sandwiched between a rule above (plain or titled)
and the window's only unmatched separator directly below - the composer's own
box. Adjacency on both edges preserves the staleness rule everywhere else,
because a glyph genuinely stranded in scrollback has transcript rows, not its own
box edges, between it and the separator below.

The rule test makes no assumption about where the title sits: mid-rule and flush
at the row's end both read as a rule, because position is the vendor's choice and
has already moved. What it does assume is structural - an overlaid title
overwrites dashes rather than displacing them, so the titled rule keeps its
partner's width. Width is proven by comparing canonical space strings, the same
idiom _fm_composer_titled_bottom_ok uses, because `${#row}` counts characters
under UTF-8 and BYTES under LC_ALL=C and a length test would disagree with itself
between locales.

This is the herdr counterpart of the cmux borderless-composer fix (kunchenguid#2029).

Verification:
- The portable regression builds the shape from its structure rather than from a
  captured pane, so it holds on every Claude release. It asserts the divergence
  from the strict predicate so the case cannot go vacuously green, covers both
  title positions across every capture profile in both locales, and reproduces
  the exact failure when only the consumer narrowing is reverted.
- Negative cases pin the boundaries: a titled row of any other width, a glyph
  separated from the closing rule by transcript rows, a non-ASCII title, a dead
  shell glyph, and a blank row all still read `unknown`; typed text still reads
  `pending` where styling proves it.
- Only the cursorless profiles regressed (herdr, zellij, cmux, orca); a tmux
  capture reaches its verdict through the cursor row and read `empty` throughout.
- The live guard now scans every claude pane rather than only the focused one,
  and reports explicitly when no pane renders a titled rule. Its idle-pane check
  derives the expected verdict from that pane's own composer row instead of from
  herdr's agent state, so an operator's unsubmitted draft reads `pending` rather
  than failing the guard on a working fleet.
- docs/verification/runtime-backends.md records the real-capture counterfactual
  and corrects a version-scoped claim: the overlay stopped rendering across two
  Claude patch releases with no code change on either side, so a version-scoped
  live pass would have rotted into a false claim of coverage.
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