Add motion design skills pack

Installed via npx skills add iart-ai/motion-design-skills. Kept the
project's existing remotion-video skill unchanged.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E35uEC1pGu95tUpM4b815L

.agents/skills/after-effects/scripts/apply-effect-to-layers.jsx

@@ -0,0 +1,49 @@
+/*
+ * apply-effect-to-layers.jsx
+ * Applies an effect (by internal matchName) to every selected layer.
+ *
+ * Why matchName: display names are localized and change between AE language
+ * versions; matchName is stable. Examples:
+ *   "ADBE Gaussian Blur 2"  -> Gaussian Blur
+ *   "ADBE Fast Box Blur"     -> Fast Box Blur
+ *   "ADBE Tint"              -> Tint
+ *   "ADBE Drop Shadow"       -> Drop Shadow
+ *   "ADBE Glo2"              -> Glow
+ *
+ * Usage: select layers in a comp, then File > Scripts > Run Script File...
+ * Edit EFFECT_MATCHNAME (and the optional parameter block) below.
+ */
+
+(function applyEffectToLayers() {
+    var EFFECT_MATCHNAME = "ADBE Gaussian Blur 2";
+
+    var comp = app.project.activeItem;
+    if (!(comp && comp instanceof CompItem)) {
+        alert("Open a composition and select one or more layers first.");
+        return;
+    }
+
+    var sel = comp.selectedLayers;
+    if (sel.length === 0) {
+        alert("No layers selected.");
+        return;
+    }
+
+    app.beginUndoGroup("Apply Effect To Layers");
+    try {
+        for (var i = 0; i < sel.length; i++) {
+            var layer = sel[i];
+            if (!(layer instanceof AVLayer)) continue; // effects need an AVLayer
+
+            var effects = layer.property("ADBE Effect Parade");
+            if (!effects.canAddProperty(EFFECT_MATCHNAME)) continue;
+
+            var fx = effects.addProperty(EFFECT_MATCHNAME);
+
+            // --- Optional: set a parameter. Example for Gaussian Blur radius ---
+            // try { fx.property("Blurriness").setValue(25); } catch (e) {}
+        }
+    } finally {
+        app.endUndoGroup();
+    }
+})();