feat(conductor): task state machine — TIMED_OUT state and retriable steps

- Add 'timed_out' to flow_runs/flow_steps CHECK constraints
- Add retry_count and max_retries columns to flow_steps
- Add timeout detection in advanceInner loop (configurable FLOW_STEP_TIMEOUT_MS)
- Add retriable logic: re-dispatch on timeout if maxRetries > 0 and retryCount < maxRetries
- Add isRetriable() + shouldRetry() pure decision functions
- Add timed_out handling to reconcileResumeStep and reconcileRun
- Add 'timed_out' to ws-frames enum, publishStep status type

apps/server/src/services/memory/index.ts

@@ -3,4 +3,9 @@ export { formatMemoryBlock } from './prompt.js';
 export { scanMemoryScopes } from './scan.js';
 export { parseMemoryEntries } from './entries.js';
 export { ensureMemoryScaffold, getMemoryRoot } from './paths.js';
+export { ContextTier } from './context-tier.js';
+export { DeepDream } from './deep-dream.js';
+export { CoreTier } from './core-tier.js';
 export type { MemoryEntry } from './entries.js';
+export type { ContextTierConfig, ConversationTurn } from './context-tier.js';
+export type { CoreTierEntry, CoreTierSearchResult, CoreTierSearchOptions } from './core-tier.js';