L3 semantic retrieval does a bad job on the repo map: docs embed a terse symbol-list
descriptor while queries embed prose intent, an asymmetric comparison that collapses all
scores into a ~0.5 noise band (session 459: junk hits at 0.53/0.54, real relevance never
reached). At 0.5 the noise-winners cleared the bar and suppressed the deterministic
repo-map floor. 0.6 sits above the noise ceiling (~0.55) and below the real-signal floor
(0.68) so noise → empty → fall back to the repo map.
Band-aid, not a fix — the real remedy is a prose-shaped repo-file descriptor so query and
document share a representation space. Calibration knob, retune if the embedder changes.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HMbPmZZjcXhR2crU82zZ8S
kami
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