adlee-was-taken bfb0ff7c00 feat(metrics): persist routing decisions and expose GET /metrics ...

The router previously recorded only completions (energy_observations),
not the routing decisions behind them, so 'how routing is performing' was
not answerable from data. This adds:

- route_decisions table + idempotent ensure_route_decisions (guarded
  CREATE TABLE IF NOT EXISTS, never regenerates a live DB) gated by
  logging.log_route_decisions; every decision kind (route/dispatch/chat/
  passthrough/local-vision) is persisted best-effort via
  persist_route_decision (never fails a request; only session_key, never
  session_dir). The table is ensured on the write path (mirroring
  proficiency_store._write -> ensure_columns) so a live DB that predates
  the feature migrates safely.
- metrics.py aggregator moved quota_burn/scoring_coverage in from the
  dispatcher (breaking a would-be circular import) and adds
  recent_decisions/per_model/verdict_mix/top_proficiency; /health now
  imports them and GET /metrics exposes the 7-key JSON (window-bounded,
  loopback-only, no auth).
- observed_at indexes on energy_observations/verifications.

2026-08-23 20:20:09 -04:00

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