Transparent fallback after parse_t212_csv: LLM extracts a column-mapping
(not the data), result is cached globally by header fingerprint, replay
is deterministic Python. Stored dummy contains headers + synthetic row
only — no user holdings ever persisted.
Design doc for three coordinated closed-beta changes: a BETA chip in
the app header, a 6h news-window cap on the free tier, and email
digests (daily for paid Mon-Sat, Sunday weekly for everyone). Draft;
awaits implementation plan.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
