feat(identity): lock NoteLett product identity across all surfaces
- productId: notelett
- displayName: NoteLett
- domain: notelett.app
- iOS bundle: com.bytelyst.notelett
- Android bundle: com.notelett.app
- backend port: 4016
- token namespace: --nl-* (CSS), NoteLettTheme (native)
Rippled through:
- shared/product.json (canonical source)
- backend package.json, config, cosmos-init, all 10 test files
- web package.json, landing page, notes-client test
- mobile app.json, package.json, auth screen
- docs: PRD, ROADMAP, architecture review, foundations, web/mobile roadmaps
- registered in learning_ai_common_plat/products/notelett/
Verification: backend typecheck + 18 tests, web typecheck + 6 tests, mobile typecheck — all pass.
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