Iter 11 surfaced "DeadCode:Flag" in the matrix — a noisy pattern_key
where "Flag" is the table column HEADER kimi produces for structured
review output, not an actual Rust identifier.
Kimi's standard format on recent iters:
| # | Change | Flag | Confidence |
| 1 | Wire AgentIdentity into.. | Boundary.. | 92% |
The extractor's KEYWORDS set already filtered Rust grammar words
(self, mut, async, etc) and the FLAG_VARIANTS themselves. Adding
markdown-layout words (Flag, Change, Confidence, PRD, Plan) closes
the last common noise class.
One-line addition — empirically validated against the iter 11
vectord trace that produced DeadCode:Flag. Future iters won't
reproduce that specific noise.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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