feat: 24-hour job queue, classifier fix, and /draft PDF tailing

[pushkarverma3698]

Summary

QA audit and fixes for the jobhunt pipeline. Seven defects fixed, all verified green.

• Classifier starvation: Generic "Software Engineer" was starving frontend track (228 backend vs 10 frontend on prod). Rewrote classifyTrack in 3 passes; 572→802 classified (+39% reaching screening, zero regressions).
• NULL posted_at regression: Hand-screened jobs vanished from the queue. Fixed with coalesce(posted_at, created_at).
• Country classification: Expanded NL cities (19→80) and IN cities (20→65) from measured real postings.
• /draft N wiring: Tailors CV, renders PDF, delivers via Telegram (HITL-gated).
• /applied N wiring: Drains row from queue by marking applied and clearing brief rank.
• Brief clarity: Added aged-out counter ("12 fresh · 319 older roles") so empty brief is unambiguous.
• Vocabulary split: Extracted 230-term classifier vocabulary into track-vocabulary.ts (LOC budget fix).

Verification

• pnpm gate ✅ green: 300 files / 3,281 tests, all ratchets at baseline
• Classification measured on 4,412 live postings: 572→802 (+39%), zero regressions
• Regression test pinned: five false positives from earlier draft designed out
• Country expansion verified: cities that produced 0 rows now produce hits; no false-positive countries
• NULL posted_at fix verified: manually pasted jobs no longer disappear on screening

Outstanding

1. Paid pipeline diagnosis: Metered lane dead since 2026-08-12 (198h). Blocks Phase 2 (registry compounding via token harvest).
2. Phase 2 – Make registry compound: Recruitee/Personio boards (~320 new), IND sponsor probe, discovered boards outside repo, harvest moved to fetch boundary.
3. Phase 3 – Denmark: Gated behind Phase 1 live-proof (applying daily).

Test Plan

• Load /brief → verify rows are all < 24h old
• /draft 1 → PDF arrives in Telegram, is tailored to that JD
• /applied 1 → row gone from /brief
• Aged-out counter shows non-zero
• Failure path: unset STORAGE_BUCKET, /draft falls back to text draft with explicit note

Related

• Phase 1 plan
• QA audit notes

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