chore(release): 4.6.0 - SPDD & Radix UI Design System

- Bump version to 4.6.0, update CHANGELOG and README counts to 626
- Fix listSkillIds to only include dirs with SKILL.md (SPDD excluded from catalog)
- Regenerate catalog and index after PR 47/48 merge

data/aliases.json

@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-01-31T22:04:24.651Z",
+  "generatedAt": "2026-02-01T07:22:00.871Z",
   "aliases": {
     "accessibility-compliance-audit": "accessibility-compliance-accessibility-audit",
     "active directory attacks": "active-directory-attacks",

data/bundles.json

@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-01-31T22:04:24.651Z",
+  "generatedAt": "2026-02-01T07:22:00.871Z",
   "bundles": {
     "core-dev": {
       "description": "Core development skills across languages, frameworks, and backend/frontend fundamentals.",

data/catalog.json

@@ -1,6 +1,6 @@
 {
-  "generatedAt": "2026-01-31T22:04:24.651Z",
-  "total": 618,
+  "generatedAt": "2026-02-01T07:22:00.871Z",
+  "total": 619,
   "skills": [
     {
       "id": "3d-web-experience",
@@ -10670,6 +10670,30 @@
       ],
       "path": "skills/quant-analyst/SKILL.md"
     },
+    {
+      "id": "radix-ui-design-system",
+      "name": "radix-ui-design-system",
+      "description": "Build accessible design systems with Radix UI primitives. Headless component customization, theming strategies, and compound component patterns for production-grade UI libraries.",
+      "category": "architecture",
+      "tags": [
+        "radix",
+        "ui"
+      ],
+      "triggers": [
+        "radix",
+        "ui",
+        "accessible",
+        "primitives",
+        "headless",
+        "component",
+        "customization",
+        "theming",
+        "compound",
+        "grade",
+        "libraries"
+      ],
+      "path": "skills/radix-ui-design-system/SKILL.md"
+    },
     {
       "id": "rag-engineer",
       "name": "rag-engineer",