id: CORE-001D2A
title: Provider and Cache Quote Normalization Boundary
status: done
priority: P1
effort: S
depends_on:
  - CORE-001D1
  - CORE-002A
tags:
  - core
  - decimal
  - cache
  - provider
summary: DataService quote payload normalization is now an explicit provider/cache boundary with tested repair and rejection rules.
completed_notes:
  - Added a named quote normalization adapter in `app/services/data_service.py` for cache/provider payloads.
  - GLD quotes repair missing or empty `quote_unit` metadata to preserve CORE-002 behavior.
  - Explicit symbol mismatches are now rejected instead of being silently rewritten.
  - Mismatched cached quotes are discarded and refreshed from the provider path.
  - Added focused boundary tests in `tests/test_data_service_normalization.py`.
  - Validated with focused pytest coverage and `make build` on `main`.