20260720 Corpus Explorer S3E Thumbnail Hang Fix

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Path: loom-builder/prompts/20260720-corpus-explorer-s3e-thumbnail-hang-fix.mdRelative: prompts/20260720-corpus-explorer-s3e-thumbnail-hang-fix.mdSubproject: loom-builderCategory: dispatch-prompts
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  1. # Corpus Explorer — S3e: fix silent hang in thumbnail pipeline, then run full batch
  3. ## Root cause, already diagnosed — do not re-diagnose
  5. The orchestrator ran `packages/etl/src/generate-thumbnails.ts --limit 5`
  6. directly. It produced 3 real WebP thumbnails successfully (60–78KB files,
  7. confirmed real, not stubs), then hung indefinitely on artifact #4 — no
  8. error, no log line, no exit. An outer `timeout 60` bash wrapper failed to
  9. kill it (SIGTERM was absorbed somewhere in the bun → camoufox-js →
  10. F