### Film reel — `wai.film.reel`, cuts over one world (2026-06-17)

- The editor's layer over `wai.film.linear`: a `WREL` embeds one sealed world
  + a sequence of **shots** (each its own camera track + frame schedule) played
  back to back. Cutting wide→close, or one beat from two angles, is film
  grammar; a reel carries it as a few kilobytes of camera keys, the world
  shared across every shot. Conformance is **reel-equivalence** —
  film-equivalence extended over cuts.
- Shots MAY revisit earlier world ticks (a cut back in time from a new angle),
  so the world is sampled at the sorted/de-duplicated union of all frame ticks
  — convergence still holds because replay-equivalence is order-independent.
- Reuses the film machinery (shared camera interpolation + pose bytes) + the
  `FilmReceipt` profile (identity = `reel_hash`); `wai_meter` grows a `.wrel`
  branch. Registered + tiered Lossless. Corpus vector `coverage` (the character
  beat cut three ways, incl. a cut back in time) joins `film-conformance/`,
  verified by `wai_film_vectors` on the four-platform matrix. SPEC §5 row +
  `extensions/linear-film.md §7`.

