Add scoped physical references for 128 Pre-Standard recordings
Expand the one-record pilot to a revision-pinned relationship layer covering all 128 Pre-Standard recordings. The sidecar records 84 creator-identified photograph-to-frame links, eight direct in-hand front-to-frame checks, and 36 creator-reported record-level physical references. These are positive, scope-limited relationships; they do not assign work IDs or establish whole-MP4 membership, recording endpoints, final physical state, or finish dates.
The private photographs and their identifiers are not included. The six changed files are the README, relationship sidecar, schema, evidence statement, manifest, and validator. The validator passes against Pre_Standard_Time_Lapses/metadata.csv at pinned source commit 275fef5594ae6302af4f6ee4edaa9d5b6f724e83.