Task Run Log Reader

• jbaruch/nanoclaw owns existing task_run_logs; src/db.ts:createSchema, called by initDatabase, defines its table and inline foreign-key rebuild.
• src/db-tasks.ts:logTaskRun appends native task outcomes.
• The unversioned table uses coding-policy's Read-Only Legacy Runtime Tables exception.
• The Main admin heartbeat's check_task_failures reads /workspace/store/messages.db through its native mount with read-only queries.
• Required columns are id, task_id, run_at, status and nullable error; native timestamps supply lookback and later-run comparisons.
• Readers never initialize, migrate, backfill or substitute this database.
• Missing database, required schema or failed queries produce an actionable unavailable issue, never empty or healthy evidence.