Document fresh PAIDF Cosmos3 media audits

[timothy-le7]

Summary

• capture the local-MP4 freshness timestamp before submission
• document the exact read-only completed-run audit for source identity, freshness, timelines, curation, and recordings
• add a regression test that keeps timestamp, submit, and audit commands in the required order
• leave the canonical workflow YAML, runtime implementation, dependencies, and platform-specific behavior unchanged

Validation

• canonical PAIDF Cosmos3 workflow validates with 17 states
• 41 PAIDF Cosmos3 workflow tests passed
• 3,441 guardrail tests passed
• lint and generated-doc drift checks passed
• staged confidentiality and gitleaks scans passed
• a fresh public-MP4 run and a fresh LeRobot v3 run each completed all 15 stages
• the exact original, normalized conditioning, and both generated videos from each run decoded fully and were opened for beginning/middle/end visual review

The visual review confirmed frame-aligned motion and scene structure in all four generated clips. One generated variant in each run applied a conspicuous warm/orange treatment with peripheral texture or halo artifacts; that is run-quality evidence for human review, not a host-platform issue or a workflow-code change.