Publish curated MobilityOps source snapshot

seed/README.md

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+# Synthetic seed data
+
+The committed CSV snapshot is fully synthetic and generated by `generate_seed.py`.
+
+Regenerate deterministically:
+
+```bash
+python seed/generate_seed.py --anchor 2026-08-01 --seed 20260801
+```
+
+The application importer must preserve the named demo references in `docs/13-seed-and-demo-scenarios.md`. Normal write APIs must enforce invariants even though the controlled seed/import path contains deliberate legacy data-quality conflicts.