The pending_task_lane migration was branching from fb1481317ff6 which
already had a child (4f4137ce79e5). Fixes multiple-heads error.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Task lane questions/actions are now saved to a pending_task_lane JSONB
column on ai_sessions, restoring them on session switch or page reload.
Partial submit no longer force-clears the lane — the AI response
controls what stays. Also removes redundant "New Session" button from
the sidebar (dashboard already provides this).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
