feat: show vectorization status of memories + stats count + force re-vectorize

[rahilp]

Summary

• Surfaces the vectorization state of every memory as a three-state badge on Recent cards: Vectorized (check), Vectorizing… (clock, within grace window), Not indexed (red warning, past grace window)
• Adds unvectorized count and vectorize_grace_ms to /stats, and exposes vector_ids on /list responses
• Adds POST /vectorize-pending endpoint that re-embeds up to 25 past-grace unvectorized entries per call, returning { processed, failed, remaining }
• Adds a Vectorize now repair action to the stats menu that loops /vectorize-pending until all failed memories are re-indexed, then refreshes the UI

How it works

vector_ids = '[]' is the de-facto failure signal — it's permanent when storeEntry throws silently inside ctx.waitUntil. A configurable grace window (VECTORIZE_GRACE_MS, default 5 min) distinguishes in-flight embeds from actual failures, so only past-grace rows are counted as failed and eligible for re-embedding.

Test Plan

• Capture a memory → Recent card shows Vectorizing… badge, flips to Vectorized after reload once embedding completes
• Back-date a row past the grace window (UPDATE entries SET vector_ids='[]', created_at=created_at-600000) → card shows Not indexed
• Stats menu shows the failed count and Vectorize now button; click → repairs entries, count drops to 0, cards flip to Vectorized
• Confirm in-grace rows are skipped by /vectorize-pending and not counted in unvectorized
• npm test → 285/285 passing

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	81.7%	567 / 694
🔵	Statements	82.52%	666 / 807
🔵	Functions	81.48%	88 / 108
🔵	Branches	76.35%	394 / 516

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/index.ts	81.34%	74.3%	80%	80.58%	106-153, 173, 444, 451, 492, 720, 831, 837, 846, 854-874, 937-940, 966, 973, 974, 985, 1007-1015, 1023-1025, 1077, 1118, 1131, 1177-1399, 1408-1412, 1425-1450, 1469, 1511, 1549, 1583, 1749-1760, 1822, 1832

Generated in workflow #134 for commit 916c374 by the Vitest Coverage Report Action