Phase 1: Foundation & Auth - Standard stack identified (Supabase Auth + @supabase/ssr) - Architecture patterns documented (dual-client, RLS, middleware) - Subscription schema researched (plans table + JSONB features) - 7 common pitfalls catalogued (missing RLS, session expiry, etc.) - Code examples verified from official Supabase docs Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>