fix: reject the tts-mcp#13 conventional-prefix golden entry

[bborbe]

What

Flips the tts-mcp#13 conventional-prefix entry from accepted to rejected in bench/golden.json, and bumps golden-curated-3 → golden-curated-4. 158 entries unchanged; the accepted/rejected split moves 138/20 → 137/21.

Why

The entry was promoted on 2026-08-18 because three models agreed on it (m3 + m2.7 + deepseek). Verification against the PR head 59f9fe8 shows the finding is not a defect:

• tts-mcp declares no conventional-prefix requirement — the word appears in neither CLAUDE.md nor AGENTS.md
• The repo's own released v0.2.0 and v0.1.0 CHANGELOG sections use the identical prose-bullet style

So it is a correct observation that names no defect — precisely the class the golden set's own rule rejects.

The reasoning error worth keeping

Three-model agreement was treated as triangulation. It wasn't: m3, m2.7 and deepseek share a conventional-commit training prior, so agreement amplified a shared bias rather than confirming a defect.

Model agreement is not independent evidence when the models share priors. Verification has to run against the repository, not a vote. This is recorded in adjudications so the correction sits next to the note that made the original claim.

Impact

Every score computed against golden-curated-3 credited models for reproducing a non-defect and penalised them for missing it. As a rejected entry it now functions as a precision probe — a model that flags it correctly loses precision.

Verification

• make bench-test — 229 tests, OK (skipped=1)
• bench/golden.json parses; entry 157 is rejected; counts confirmed 137 accepted / 21 rejected
• Diff is 3 semantic lines plus the appended adjudication note — no reformatting

[ben-s-pull-request-reviewer]

Both plan concerns are confirmed as correctly addressed:

1. Entry 11 (tts-mcp#13) — state flipped from "accepted" → "rejected". Version bumped golden-curated-3 → golden-curated-4. Rejected count moved 20 → 21 ✓
2. Adjudications — New entry appended at index 2067 (2026-08-26 CORRECTION…) is a single new string, not a duplicate ✓
3. CHANGELOG.md — Single ## Unreleased bullet with fix: prefix, properly formatted ✓

No code files changed. No rule violations applicable. No concerns remaining.

{
  "verdict": "approve",
  "summary": "Clean precision correction: a single golden-set entry (tts-mcp#13) is flipped accepted→rejected with correct version bump, adjudication note, and CHANGELOG entry. 21 rejected entries confirmed (20→21 delta). No code, no violations.",
  "comments": [],
  "concerns_addressed": [
    "correctness: entry 11 flipped accepted->rejected, version golden-curated-3->golden-curated-4, rejected count 20->21 — verified",
    "correctness: adjudations array has one new entry (index 2067) with no duplication — verified"
  ]
}