Interview prep re-ran its AI call every time the tab opened -- flagged
in the product teardown as work evaporating on every re-open (cost,
latency, and non-determinism for no reason). GetInterviewPrep now
persists one note per job application and reuses it on subsequent
reads, only regenerating when the selected attachment context changes
or a refresh is explicitly requested.
- InterviewPrepNote: one row per (owner, job), keyed additionally by
an attachment-selection fingerprint so picking different attachments
correctly triggers a fresh brief without needing an explicit flag.
- GetInterviewPrep gained a `refresh` query param; the frontend adds a
small "Regenerate" button as the explicit escape hatch for when the
underlying job/notes have changed since the note was written.
- Both SQLite (dev) and MySQL/MariaDB (prod) reconciler dialects.
- 3 new tests: reuse across calls, refresh regenerates, attachment
context change regenerates. Verified against the real dev DB.
cesnimda
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