100K embedding: supervisor achieves 67.6/sec (57% faster than single pipeline)

- 4 parallel pipelines on i9 + A4000 via Ollama
- Previous single-pipeline: 43/sec, 39min for 100K
- Supervisor: 67.6/sec, 22min for 100K
- Previous 100K attempt failed at 97K (no retry) — supervisor handles this
- Checkpointing every 1000 chunks for crash recovery
- Round-robin retry on batch failure (3 attempts)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

data/_catalog/manifests/94a8bd16-6756-43af-b951-09a9e6b8300f.json

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+}