Trace Recorder — TraceStore interface, MySQL sink, DP fields

[a-yeyang]

Summary

• Extract TraceStore interface (insert / upsert / getById / list / close) — recorder depends only on the interface (no SQLite / Gateway API references). Local JSON file output kept per spec.
• Add MysqlTraceStore + CompositeTraceStore (dual-write, warn on partial failure); SqliteTraceStore kept as default impl.
• Env-driven config: SICLAW_TRACE_MYSQL_ENABLED / SICLAW_TRACE_SQLITE_ENABLED / SICLAW_TRACE_MYSQL_URL. Default: MySQL on, SQLite off.
• New JSON-body + DB columns: isInjectedPrompt (UI-button classifier) and dpStatusEnd.
• Two-phase persistence (stub at beginPrompt → UPSERT at flush) preserves rows across hung prompts.
• New recordSteerEvent captures DP button clicks ([DP_CONFIRM] etc.) that bypass /api/prompt.
• Preserved: JSON file output, schemaVersion, /api/traces API, explicit-boundary mode.

Query MySQL

kubectl exec -it siclaw-trace-db-6964dd6859-nw7td -- \
  mysql -u root -psiclawsiclawsiclaw --default-character-set=utf8mb4


SELECT id, session_id, username, user_message, mode, brain_type, model_name,
       outcome, duration_ms, cost_usd, created_at
  FROM siclaw_traces.agent_traces ORDER BY created_at DESC LIMIT 3;