chore: commit supabase config, phase 2/4 plan docs, extend gitignore

- supabase/config.toml + supabase/.gitignore from supabase init (needed
  for supabase db push / local dev)
- phase 2 and phase 4 implementation plans referenced by the SDD
  progress ledger but never committed
- ignore local tooling dirs (node_modules.nosync, graphify-out, .claude)
  and iCloud "name 2.ext" sync-conflict copies

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ

.gitignore

@@ -43,3 +43,11 @@ public/qr/*.png
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# local tooling artifacts
+node_modules.nosync/
+graphify-out/
+.claude/
+
+# iCloud sync conflict copies ("name 2.ext")
+* 2.*