docs(diagnostics): add REMOTE_DIAGNOSTICS_ROADMAP.md with 140+ tasks across 4 phases
Complete roadmap for remote debug tracing system with:
- Phase 1: Server foundation (types, repository, routes, 38+ tests)
- Phase 2: Client SDKs (TypeScript, Swift, Kotlin)
- Phase 3: Admin UI (Next.js dashboard)
- Phase 4: Advanced features (auto-triggers, profiling)
Review fixes included:
- Fixed partition keys to avoid hot partitions (composite pk)
- Added PII redaction patterns (email, SSN, CC, phone, IP, JWT)
- Added event bus integration with 8 events
- Fixed screenshot storage to use Azure Blob
- Added rate limiting specs for all endpoints
- Added ETag caching for config polling
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