feat(L1): wire 6 Mixamo mocap clips; gitignore FBX binaries; opt-in moves via clip directive

Clips sourced from Mixamo, kept out of the repo (loaded from public/clips, gitignored for
storage/CDN). Mapped walk/squat/bicycle-crunch/jab-cross/jumping-jacks/shuffling in the
playground; squat/jumping-jacks/jab-cross/bicycle-crunch opt in with clip "<name>".
Verified: squat plays the retargeted Back Squat clip (clipActive=true), no console errors.

Author: a-baran-orhan

.gitignore

@@ -6,3 +6,8 @@ coverage/
 .vite/
 .vercel
 .claude/worktrees/
+
+# Mocap clip binaries: sourced from Mixamo, loaded from storage/CDN, not committed.
+playground/public/clips/*.fbx
+playground/public/clips/*.glb
+playground/public/clips/.DS_Store

playground/src/main.ts

@@ -548,7 +548,18 @@ void import("posecode-render").then(({ createViewer }) => {
     // clips.ts). Only fetched when a loaded movement names the clip, so this
     // never slows the default page. Disabled with the classic figure, which has
     // no skinned mesh to retarget onto.
-    ...(classicFigure ? {} : { clips: { walk: "/clips/walk.fbx" } }),
+    ...(classicFigure
+      ? {}
+      : {
+          clips: {
+            walk: "/clips/walk.fbx",
+            squat: "/clips/back-squat.fbx",
+            "bicycle-crunch": "/clips/bicycle-crunch.fbx",
+            "jab-cross": "/clips/jab-cross.fbx",
+            "jumping-jacks": "/clips/jumping-jacks.fbx",
+            shuffling: "/clips/shuffling.fbx",
+          },
+        }),
   });
   // Exposed for capture/e2e tooling (frame capture drives README GIFs).
   (window as unknown as Record<string, unknown>).__posecodeViewer = viewer;

spec/examples/bicycle-crunch.posecode

@@ -1,5 +1,6 @@
 posecode exercise "Bicycle crunch"
   rig humanoid
+  clip "bicycle-crunch"
   pose start = supine
 
   step "Set" 0.8s ease-in-out:

spec/examples/jab-cross.posecode

@@ -1,5 +1,6 @@
 posecode exercise "Jab-cross"
   rig humanoid
+  clip "jab-cross"
   pose start = standing
 
   step "Jab" 0.4s ease-out:

spec/examples/jumping-jacks.posecode

@@ -1,5 +1,6 @@
 posecode exercise "Jumping jacks"
   rig humanoid
+  clip "jumping-jacks"
   pose start = standing
 
   step "Out" 0.5s ease-out:

spec/examples/squat.posecode

@@ -1,5 +1,6 @@
 posecode exercise "Body-weight squat"
   rig humanoid
+  clip "squat"
   pose start = standing
 
   step "Descend" 1.6s settle: