Add Claude fast mode support across adapter and composer controls

- support `claudeAgent.fastMode` in shared/contracts, provider dispatch, and Claude adapter SDK settings
- gate fast mode to supported Claude models and restart/forward options in orchestration
- unify draft/UI fast mode state (not Codex-only) and add browser/server tests plus SDK probe
f98679d217Julius Marminge committed on 3/17/2026, 9:36:35 PMparent5c9cfcd
19 files changedLine totals unavailable