Research notes R1-R4, documentation-study files A-E (source of the
functional spec's `src:` tags) and PGx coverage CSVs, rewritten to use
neutral naming and current project decisions (plan §2).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01814GKVzZVL3FuF3DeiZXhv
