uwf thread resume now supports completed threads:
- Evaluates workflow graph from $START to find first role
- Clears completed state (status → idle, completedAt → null)
- Builds resume prompt with supplement context
- Full CAS chain preserved for rich context
Suspended resume behavior unchanged.
Cancelled/idle threads still rejected.
425 tests pass.
Part of #39, closes#43
- store.ts: all threads in @uwf/thread/* with status tag
- Remove HISTORY_VAR_PREFIX, ThreadHistoryLine, deleteThread
- Add loadActiveThreads, loadHistoryThreads, completeThread
- Add migrateHistoryVarsToThreadVars migration
- thread.ts: replace deleteThread+addHistoryEntry with completeThread
- shared.ts: remove findHistoryEntry fallback
- Update all tests for unified storage model
422 tests pass.
Part of #39, closes#41, closes#42
- ThreadIndexEntry gains status and completedAt fields
- createThreadIndexEntry defaults to idle/null
- normalizeThreadIndexEntry backward-compat defaults
- updateThreadHead resets to idle (衔尾蛇 resume prep)
- markThreadSuspended sets status=suspended
- New markThreadCompleted(entry, status, now) function
- serializeThreadIndexEntry includes new fields
Part of #39, closes#40