Fix batch worker writing extraction.json to wrong product directory ( close #26 )

[kiannidev]

Summary

Fixes #26 — the Anthropic batch poll worker wrote extraction.json to {DATA_DIR}/{slug}/ instead of the nested product path (e.g. server/dell/poweredge/r770/).

Related Issue

Fixes #26

Change Type

• Bug fix
• Regression tests
• New feature
• UI change
• Security fix
• Documentation only

What Changed

• Added productPathRel to ProductContext and exported helpers:
  • batchCustomId(ctx) — full nested path used as Anthropic Batch custom_id
  • resolveBatchProductDir(customId) — resolves write directory with data-root confinement
• submitBatchForCategory() now sets custom_id to the full product path, not bare slug
• Batch worker uses resolveBatchProductDir() instead of path.resolve(DATA_DIR, slug)
• insertResult() stores the batch custom id so worker DB lookup matches Anthropic results
• Run detail page links to /products/[slug] using basename when stored path is nested
• writeExtractionJson() calls invalidateExtractionCache() after every write
• Added tests/unit/extract-batch.test.ts (4 cases)

Files Changed

File	Change
lib/pipeline/extract.ts	productPathRel, batch helpers, custom_id fix, cache invalidation
worker/handlers/anthropic-batch.ts	Resolve nested product dir from custom_id
app/api/pipeline/extract/route.ts	Store batch custom id in extraction_results
scripts/extract-one.ts	Same insert fix for CLI batch mode
app/pipeline/runs/[id]/page.tsx	Product page links use basename of nested path
tests/unit/extract-batch.test.ts	New regression tests

Validation

./node_modules/.bin/tsc --noEmit   # pass
npm run build                      # pass
npm test                           # run locally (4 new + existing tests)

Test Plan

• Submit batch via API for r770 under server category
• Run worker until batch completes
• Confirm extraction.json written to data/sample/server/dell/poweredge/r770/
• Confirm data/sample/r770/ is NOT created
• Reload product page — new extraction visible immediately (cache invalidated)
• Run detail page product link opens /products/r770