FR-CULL-5. Frames join a burst when they are adjacent in time and look
like the frame before them -- both, because time alone groups a whole
ceremony and similarity alone groups a studio setup across two days.
Adjacent pairs only, chained; there is no all-pairs step and there must
never be one.
No selection of any kind. The representative is the earliest frame, a
fact about the clock rather than a judgement about the photograph, and a
newly found burst arrives open, so the pass never takes a row off the
screen.
Verified: fmt, clippy --workspace --all-targets -D warnings, 346
dr-catalog tests, 511 dr-ui tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>