fix(verdict-gate): a failed git call is reported as not measured, not stale

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/HANDOVER-CONTRACTS.md

@@ -431,7 +431,7 @@ missing `exit_code` (C15, `PROGRESS_FAILED_CRITERIA_KEY`).
 
 **Consumer:** `/trekplan` Phase 1 when `--brief review.md` is supplied and the consumer detects `type: trekreview` in frontmatter. The plan command branches into a remediation-plan path: BLOCKER + MAJOR findings become plan goals, the produced `plan.md` carries a `source_findings: [<id>, ...]` frontmatter list as the audit trail back to the consumed findings. MINOR + SUGGESTION are skipped for plan-input. Since 1.1 every BLOCKER is also written as a numbered `### Step R<n>` under `## Remediation Steps` (Files · Source finding · Test first · Verify · On failure), so a consumer can append it as a plan step without rewording it.
 
-**Second consumer — the verdict gate (K7, 1.1):** `lib/review/verdict-gate.mjs <review.md>` reads the frontmatter `verdict` and exits 0 = ALLOW/WARN, 1 = BLOCK, 2 = could not decide. Exit 2 is never green: a missing file, a missing or unknown verdict, two verdict lines, a trailing JSON block that is not the last fence or lacks `verdict`/`counts`/`findings`, and a file whose JSON block, `## Findings (BLOCKER)` section or finding-id list contradicts a greener verdict all land there — and so does a WARN that exists because a reviewer or engine did not run (`missing-reviewer:` / `unattributable-payload` in the JSON block's `allow_blocked_by`, which a 1.1 review must carry): a review not performed in full stops a merge (operator decision 2026-10-06). Exactly one file per call. With `--repo <dir>` (`verdict-gate.mjs --json <review.md> --repo <dir>`, R6) an ALLOW/WARN review must also be of the commit being merged in `<dir>`: its `scope_sha_end` is HEAD, or an ancestor of HEAD whose later commits change only the review lessons (`.claude/rules/voyage-review-lessons.md`, inside its managed block) and the `CLAUDE.md` pointer (`lib/review/reviewed-commit.mjs`); otherwise exit 2 with a reason that starts `review-stale:`, which `/trekexecute`'s merge lock (Phase 7.2 step 4 and Phase 8, both with `--repo .`) maps to the decline reason `review-stale`. A `--repo` with no value is exit 2 as well; BLOCK stays exit 1. Whatever stops a merge or a release on a review reads this exit code, never a summary. Borrowed: the verdict goes to a file and a command gates on it (Kiro `feature-pipeline`); the executor reads the verdict but never writes it (Spec Kit).
+**Second consumer — the verdict gate (K7, 1.1):** `lib/review/verdict-gate.mjs <review.md>` reads the frontmatter `verdict` and exits 0 = ALLOW/WARN, 1 = BLOCK, 2 = could not decide. Exit 2 is never green: a missing file, a missing or unknown verdict, two verdict lines, a trailing JSON block that is not the last fence or lacks `verdict`/`counts`/`findings`, and a file whose JSON block, `## Findings (BLOCKER)` section or finding-id list contradicts a greener verdict all land there — and so does a WARN that exists because a reviewer or engine did not run (`missing-reviewer:` / `unattributable-payload` in the JSON block's `allow_blocked_by`, which a 1.1 review must carry): a review not performed in full stops a merge (operator decision 2026-10-06). Exactly one file per call. With `--repo <dir>` (`verdict-gate.mjs --json <review.md> --repo <dir>`, R6) an ALLOW/WARN review must also be of the commit being merged in `<dir>`: its `scope_sha_end`, read only as a full 40- or 64-hex commit id (a short id or a ref name is stale), is HEAD, or an ancestor of HEAD whose later commits change only the review lessons (`.claude/rules/voyage-review-lessons.md`, inside its managed block) and the `CLAUDE.md` pointer (`lib/review/reviewed-commit.mjs`); otherwise exit 2 with a reason that starts `review-stale:`, which `/trekexecute`'s merge lock (Phase 7.2 step 4 and Phase 8, both with `--repo .`) maps to the decline reason `review-stale`. When the gate cannot look (the `--repo` path is missing, it is no git repository, or a git call failed), the exit is 2 with a reason that starts `review-not-measured:`, never `review-stale:`: the merge lock reports it as not measured, never green. A `--repo` with no value is exit 2 as well; BLOCK stays exit 1. Whatever stops a merge or a release on a review reads this exit code, never a summary. Borrowed: the verdict goes to a file and a command gates on it (Kiro `feature-pipeline`); the executor reads the verdict but never writes it (Spec Kit).
 
 **Path conventions:**
 - Project-dir mode (recommended): `{project_dir}/review.md` (one per review iteration; subsequent runs overwrite atomically).
@@ -442,12 +442,12 @@ missing `exit_code` (C15, `PROGRESS_FAILED_CRITERIA_KEY`).
 | Field | Type | Required | Allowed values | Notes |
 |---|---|---|---|---|
 | `type` | string | yes | `trekreview` | Hard-coded discriminator |
-| `review_version` | string | yes | `"1.0"` (current) | Bump on schema change |
+| `review_version` | string | yes | `"1.1"` (current) | Bump on schema change |
 | `task` | string | yes | one-line description | Mirrors brief task |
 | `slug` | string | yes | URL-safe slug | Used in project_dir |
 | `project_dir` | string | yes | `.claude/projects/{date}-{slug}/` | |
 | `brief_path` | string | yes | path to consumed `brief.md` | Audit trail back to brief |
-| `scope_sha_end` | string | yes | git sha of HEAD at review time | Defines "after" boundary |
+| `scope_sha_end` | string | yes | git sha of HEAD at review time, as a full 40- or 64-hex commit id | Defines "after" boundary. The verdict gate reads only a full 40- or 64-hex commit id (M11): a short id or a ref name can also be a branch, which resolves to wherever it points now |
 | `reviewed_files_count` | number | yes | ≥ 0 | From triage gate Coverage |
 | `findings` | list | yes | block-style YAML list of 40-char hex IDs; `[]` when empty | Flat array; full objects in body. A bare `findings:` is null and fails |
 | `verdict` | string | yes (1.1; strict at write, warning at read) | `BLOCK \| WARN \| ALLOW` | Coordinator output; equals the trailing JSON block's `verdict` (K7) |