feat: Phase 5 BYOB foundation + Phase 3 GitHub integration

Phase 5 - BYOB Backend (TASK-007A/B):
- LocalSQL Adapter with full CloudStore API compatibility
- QueryBuilder translates Parse-style queries to SQL
- SchemaManager with PostgreSQL/Supabase export
- LocalBackendServer with REST endpoints
- BackendManager with IPC handlers for Electron
- In-memory fallback when better-sqlite3 unavailable

Phase 3 - GitHub Panel (GIT-004):
- Issues tab with list/detail views
- Pull Requests tab with list/detail views
- GitHub API client with OAuth support
- Repository info hook integration

Phase 3 - Editor UX Bugfixes (TASK-013):
- Legacy runtime detection banners
- Read-only enforcement for legacy projects
- Code editor modal close improvements
- Property panel stuck state fix
- Blockly node deletion and UI polish

Phase 11 - Cloud Functions Planning:
- Architecture documentation for workflow automation
- Execution history storage schema design
- Canvas overlay concept for debugging

Docs: Updated LEARNINGS.md and COMMON-ISSUES.md

packages/noodl-editor/package.json

@@ -94,7 +94,9 @@
     "react-dom": "19.0.0",
     "react-hot-toast": "^2.6.0",
     "react-instantsearch": "^7.16.2",
+    "react-markdown": "^9.1.0",
     "react-rnd": "^10.5.2",
+    "remark-gfm": "^4.0.1",
     "remarkable": "^2.0.1",
     "s3": "github:noodlapp/node-s3-client",
     "string.prototype.matchall": "^4.0.12",