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

scripts/update_readme.py

@@ -36,7 +36,7 @@ def update_readme():
 
     # 3. Update Intro Text Count
     content = re.sub(
-        r"(library of \*\*)\d+( high-performance skills\*\*)",
+        r"(library of \*\*)\d+( high-performance agentic skills\*\*)",
         rf"\g<1>{total_skills}\g<2>",
         content,
     )