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Iter 9 revealed two quality bugs in the extractor: 1. Kimi wraps the Flag column in backticks (\`DeadCode\`), so the flag name itself was captured as a code token. Result: pattern_keys like "DeadCode:DeadCode" that match nothing and add noise to the index. Fix: filter FLAG_VARIANTS out of token candidates. 2. Complex backtick content like \`Foo::bar(&self) -> u64\` was rejected wholesale by the identifier regex. Fallback now scans for identifier substrings and ranks by ::-qualified paths first, then length. Bonus: filter Rust keywords (self, mut, async, etc) since they're grammar, not bug-shape signal. Dry-run on iter 9 delta.rs output produces semantically meaningful keys: DeadCode:DeltaStats::tombstones_applied NullableConfusion:DeltaError-DeltaStats-apply_delta BoundaryViolation:apply_delta-journald::emit-rows_dropped_by_tombstones PseudoImpl:apply_delta-delta_ops-validate_schema These are stable under reviewer prose variation (canonical sort + top-3 slice) and precise enough to separate different bugs within the same Flag category. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>