feat(motion): choreography engines + two renderer root causes fixed (#543)

The release cuts read as static screen recordings: one 6s cursor glide
that then vanished, a locked-off camera, metronomic flat card fades. And
two renderer defects were silently wrecking every cut:

- @hyperframes/producer floated (^0.7.36, no lockfile — image builds get
  whatever is latest): 0.7.60 fails EVERY render with "Cannot access 'rt'
  before initialization". Pinned 0.7.36 exact and committed
  package-lock.json so sidecar builds are reproducible.
- the producer's per-clip visibility scheduler runs on a clock that lags
  ~50% behind the encoded timeline on a 40s cut — the final frame showed
  the authored ~18s state, so the tail scenes (bell card, toast, outro)
  were silently missing from the MP4. This, not authoring, is why
  rendered cuts kept losing their late scenes. Fix: clip windows are for
  structural layers only (hero, panel frame, status); every beat rides
  base-hidden styles + delayed CSS animations, which run on the true
  clock. Verified frame-by-frame: all four cards, stats, toast, and
  outro now land exactly on schedule in both cuts.

Craft, made reusable in the kit instead of per-composition heroics:

- kit.js choreographCursor: data-waypoints="t x y [click]; ..." generates
  a multi-leg eased path with fade in/out, an idle-hand sway, and click
  rings + glyph press dips — the cursor behaves like a hand, never pops
  in, freezes, or blinks out
- kit.js choreographCamera: data-shots="t x y scale; ..." — push-ins
  toward each beat's focal point, pull-backs for reveals, settle to end
- release-0.25.0 both cuts re-choreographed: the cursor is the CEO's
  hand (settle on the intake while it types, ONE submit click, witness
  each card completing, acknowledge the toast, exit off-frame); the
  camera lives on every beat; springy card entrances replace flat fades
- motion/README.md gains 'Cinematography & rhythm' (shot-list-first, no
  locked-off camera, verify motion with frame PAIRS) + the clip-window
  rule; kit/README.md documents both engines; the dev video prompt block
  carries the craft bar

Verified end to end through the real sidecar: both cuts render green,
32-frame strips read visually — cursor travels and clicks on schedule,
camera moves, every scene present. motion pnpm test 15/15.

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

video-renderer/package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@hyperframes/engine": "^0.7.36",
-    "@hyperframes/producer": "^0.7.36",
+    "@hyperframes/producer": "0.7.36",
     "express": "^5.0.0",
     "express-rate-limit": "^8.5.2",
     "multer": "^2.0.0",