chore: SOTA audit fixes – catalog recursive, readme regex, docs, CI, installer

- P0: Catalog includes nested skills (listSkillIdsRecursive), 626 skills
- P0: update_readme.py regex fixes 'high-performance agentic skills'
- P1: SKILL_ANATOMY risk values aligned to none|safe|critical|offensive (EN + vi)
- P1: requirements.txt + CONTRIBUTING Python setup
- P1: data/package.json version 4.6.0
- P2: npm run test + CI test step; validator docs + validation-baseline in .gitignore
- P3: Installer --version/--tag support; CI npm audit; __pycache__ in .gitignore

.github/workflows/ci.yml

@@ -45,6 +45,13 @@ jobs:
       - name: Install npm dependencies
         run: npm ci
 
+      - name: Audit npm dependencies
+        run: npm audit --audit-level=high
+        continue-on-error: true
+
+      - name: Run tests
+        run: npm run test
+
       - name: 📦 Build catalog
         run: npm run catalog