Brings in the Phase 2A follow-up fixes (booking-slot uniqueness,
booked_slots cleanup on reschedule/cancel/delete, notification_failures
table, worktree-exclusion hardening for eslint/vitest) so Task 12's
local verification runs against the fully-integrated schema.
Resolved the rls.test.sql conflict by hand: both branches independently
appended tests at the end of the file. Combined both sets (bucket-1's
booking/slot/notification tests + this branch's salon-images/booking-
completed tests) and bumped select plan() from 17/37 to 42, matching
the true combined assertion count.
Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH
71b812d5d4