Add revision-pinned fragment sequence relationships

Add five-sequence metadata and provenance documentation

Ingest 2026-08-23 Rec03 master (#26)

Stage three verified August 2026 Standard recordings (#15)

Promote clean July 13 record to Standard (#14)

Ingest 17 verified Standard records (#13)

Correct distinct March and April 2026 records (#12)

Enforce identical Viewer feature types (#9)

Prepare v0.3 metadata-complete active index (#8)

Prepare v0.2 metadata and documentation release (#2)