Running the suite from the main checkout was picking up each
worktree's full copy of src/ under .claude/worktrees/, silently
running every test twice. The existing supabase/functions/** exclude
only matched at repo root, so it also missed the nested worktree's
copy of that path.
Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH
Adds supabase/functions/ (deno.json, _shared/email.ts) with pure
buildBookingNotificationEmail/buildInquiryNotificationEmail functions
for Task 6's Edge Functions, tested via Deno's test runner. Excludes
supabase/functions/** from the root Vitest config, which otherwise
tried to resolve the jsr: import and failed.
Adds emulator-backed rules-unit tests verifying the Firestore rules
committed in Task 3, including the global constraint that
bookings/inquiries are never publicly readable. Excludes
firebase-tests/ from the default vitest run since it needs the
emulator (via `npm run test:rules`) rather than jsdom.
