Introduce a draft lifecycle for planning sessions: typing into the
PlanningModeModal textarea now creates a server-side draft after a
300ms debounce, persisted with status='draft' so the user's in-flight
plan survives modal close/reopen and shows up immediately in the
session list.
- planning.ts: new createDraftSession path; persistSession status
union widened to include 'draft'; Session gains an explicit title
field so subsequent updates don't clobber it.
- register-planning-subtask-routes.ts: wires the createPlanningDraft
POST endpoint that the modal calls on debounce.
- ai-session-store.ts: tracks the draft status across queries so the
session list and locks behave the same as any active session.
- legacy.ts: client wrapper for createPlanningDraft.
- PlanningModeModal styling, tests, and ModalReentry coverage updated
for the new flow.
- docs/architecture.md notes the expanded ai_sessions.status lifecycle.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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