docs(skills): teach transforms-over-layout-props up front

Reframe the gsap "prefer transforms" guidance from a GPU-perf nicety to the
real HyperFrames render-correctness reason: the seek-by-frame capture engine
integer-snaps layout props, so slow tweens stutter. Add the CSS-rest + x/y
offset conversion recipe, the parent-relative %/px note, and the one
exception (html-in-canvas <canvas layoutsubtree> elements). Frames the
gsap_non_transform_motion lint rule as the backstop, not the teacher, so
agents reach for transforms up front instead of relying on lint to reject.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

skills-manifest.json

@@ -18,7 +18,7 @@
       "files": 1
     },
     "hyperframes-animation": {
-      "hash": "57458f4308708e21",
+      "hash": "9f0ccb60ff53e739",
       "files": 115
     },
     "hyperframes-cli": {