docs(w2): mark plan tasks 1-7/9 done + sync CLAUDE.md §8 + write W2 retro
- plan: flip 43 checkboxes done across Task 1-7/9; Task 8 (manual speed
baseline) and Task 10 (this retro) intentionally left open
- CLAUDE.md §8: AI/ ⚠️ partial (AIRuntime/LLMSession/ModelStore/TokenChunk
done, VLSession/Prompts/ pending); FileVault ✅; add Debug/DebugAIRunner ✅;
drop bold from "W2 当前" and tag W2-W3 row 进行中
- new retros/2026-05-31-w2.md: status table, TBD speed baseline,
off-plan Symptom/Timeline/ArchiveListView/AppIcon/Swift6 cleanup,
Swift 6 + Simulator sandbox learnings, W3 prep checklist
b80fae35c9