20260720 Corpus Explorer S3D Real Thumbnails

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  1. # Corpus Explorer — S3d: real WebP thumbnails for renderable artifacts (Camoufox pipeline)
  3. ## Why this dispatch is different from the last thumbnail attempt
  5. Two prior attempts (S2, S3-retry) failed to produce real thumbnails — one
  6. shipped a placeholder, one skipped it with an inaccurate excuse ("no corpus
  7. data", which is false — S1 built 2,995 artifacts, 485 flagged
  8. `renderable`, in `apps/site/public/data/artifacts.parquet`). Root cause,
  9. per the orchestrator's own review: those dispatches neve