- ARCHITECTURE.md: reflect the implemented DI service layer, CAMTParser,
OpenTelemetry/observability, the ported report engine, and CAMT+MT940
banking; mark the resolved observations.
- copilot-instructions.md: add Services/DI, dual-format banking, observability
and testing sections; add an Instruction-Sync banner.
- CLAUDE.md (new): Claude Code project instructions mirroring the shared rules,
plus build/test workflow notes. Both files state they must stay in sync.
- USER_GUIDE.md (new, Fuchs/Docs): end-user process guide (login, invoices,
reminders, requests, banking incl. MT940/CAMT upload, DATEV, reports).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Stefan