feat: update Clean Code skill and stabilize registry (#69)

feat: update clean-code skill and stabilize registry

- Updated clean-code skill with Robert C. Martin's Clean Code principles
- Fixed invalid heading format
- Stabilized registry with SOURCE_DATE_EPOCH for deterministic CI builds
- Included in release v4.11.0

Co-authored-by: jackjin1997 <jackjin1997@users.noreply.github.com>

data/aliases.json

@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-02-08T10:02:49.626Z",
+  "generatedAt": "2026-02-08T00:00:00.000Z",
   "aliases": {
     "accessibility-compliance-audit": "accessibility-compliance-accessibility-audit",
     "active directory attacks": "active-directory-attacks",

data/bundles.json

@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-02-08T10:02:49.626Z",
+  "generatedAt": "2026-02-08T00:00:00.000Z",
   "bundles": {
     "core-dev": {
       "description": "Core development skills across languages, frameworks, and backend/frontend fundamentals.",

data/catalog.json

@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-02-08T10:02:49.626Z",
+  "generatedAt": "2026-02-08T00:00:00.000Z",
   "total": 713,
   "skills": [
     {