[coderback]

Why

Windrush has only read job emails since Gmail was connected, so earlier applications are missing. Application-style subjects also catch job alerts: "Junior Application Software Engineer at X: up to £45K/year" matches only because of its title. With past applications added automatically, an alert must never become one.

What changed

• Backfill: the Inbox can read 6 months, 1 year or 2 years back. It shows the count first, runs in the background with progress and a Stop button, and carries on where it stopped. Gmail quota errors make it wait; if the model can't be reached it stops and leaves that email unread.
• Adding applications: one is added automatically only when an email shows it was made, marked as from email, with its path rebuilt from its emails. Being received or turned down is enough. An interview, test or offer also needs an applicant tracking system, the employer's own address, or a company another email already showed.
• Older emails on tracked applications: they fill in history without moving the application back, and ask nothing of the user. Anything too unclear to add goes under Other.
• Job alerts: recognised by sender and subject and never sent to the model, in the regular sync too. Real confirmations from the same senders ("your application was sent to X") still count, because what the subject says is checked first. The model's prompt also says only applications actually made count.
• Names: a job board is no longer taken for the employer. A board's confirmation naming only the role goes under "Employer not named (via Indeed)", and an email naming no role adds "Role not stated" unless another of its emails names it.

The backfill search leaves out tracked company names, which mostly matched mail that isn't about jobs: 311 emails for 6 months, against 1,231 with them.

Results

A read-only trial on real mail ran the alert filter over the 156 unread emails from the last 6 months and the reader on a random 60 of the rest. No alert would be added: the filter caught 6, and the model rejected 14 more unrelated emails. The trial found the name problems fixed above, and the re-run showed them fixed.

The real-model eval, now 20 emails including new alert cases, scored 20/20 and then 19/20 after the final prompt change. The miss read a "your application was sent to" sample as unrelated; the real ones in the trial were read correctly.

Testing

• Backend: 1169 passed, 8 skipped, 46 browser tests deselected, run with the whole stack applied. An earlier run on the same code had 57 errors that didn't come back on re-run; they weren't captured, so the cause is unknown.
• Frontend: type check, lint, build and all 20 browser tests pass.
• Not run: the real backfill, which saves applications. It's started from the Inbox.

Merge order

Second of three. Based on feat/status-history.