Datasets:

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maxwellinked

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time-lapse-artifacts

Like 3

Summary

• define standard-2025-07-13 as the earlier Standard workflow
• define standard-2026-08-27 as the prospective canonical fragment-sequence workflow
• apply the prospective version only to the 186 canonical record_id values listed in the six dated fragment_sequence_relationships.csv sidecars from 2026-08-27 through 2026-09-02
• retain standard-2025-07-13 for the 19 historical RecNN rows outside those sidecars
• document and validate that every RecNN member of one prospective grouping shares the finish date and time of the complete grouping/physical work; RecNN records chronological group position, not an individual fragment end time
• extend metadata and semantic validation for the focused boundary

Preserved invariants

• no MP4 was modified, renamed, moved, uploaded, or re-encoded
• no record_id, file path, hub_xet_hash, size_bytes, technical field, or provenance relationship changed
• no fragment relationship sidecar changed
• SHA256SUMS is byte-identical

Validation

• regression suite: 35/35 passed
• metadata/protocol/current inventory: 0 errors; 363 earlier Standard rows and 186 prospective rows
• six current fragment relationship joins: 0 errors; 186 canonical fragments across 25 groupings
• six pinned-revision relationship receipts: 0 errors
• checksum coverage: 0 errors; 683 payloads, including 682 MP4 and one ZIP
• physical-reference relationships: 0 errors; 309 unique record relationships
• protected-field audit: 186 protocol cells changed; all other metadata fields unchanged

This PR is intentionally left as a draft pending exact remote-head review and separate merge authorization.