feat: add NIST CSF 2.0 nist_csf field to all 754 cybersecurity skills

Mapped every skill to NIST CSF 2.0 subcategory IDs (GV/ID/PR/DE/RS/RC functions)
based on subdomain and content analysis. Restores 11 skills corrupted during
prior rebase, re-enriching with ATLAS, D3FEND, NIST AI RMF, and CSF 2.0 fields.

All 754 skills now carry structured mappings for all 5 security frameworks:
- MITRE ATT&CK (in tags)
- MITRE ATLAS v5.5 (atlas_techniques)
- MITRE D3FEND v1.3 (d3fend_techniques)
- NIST AI RMF 1.0 (nist_ai_rmf)
- NIST CSF 2.0 (nist_csf)

skills/implementing-github-advanced-security-for-code-scanning/SKILL.md

@@ -1,12 +1,25 @@
 ---
 name: implementing-github-advanced-security-for-code-scanning
-description: Configure GitHub Advanced Security with CodeQL to perform automated static analysis and vulnerability detection across repositories at enterprise scale.
+description: Configure GitHub Advanced Security with CodeQL to perform automated static analysis and vulnerability detection
+  across repositories at enterprise scale.
 domain: cybersecurity
 subdomain: devsecops
-tags: [github-advanced-security, codeql, sast, code-scanning, supply-chain-security, devops-security, shift-left]
-version: "1.0"
+tags:
+- github-advanced-security
+- codeql
+- sast
+- code-scanning
+- supply-chain-security
+- devops-security
+- shift-left
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- GV.SC-07
+- ID.IM-04
+- PR.PS-04
 ---
 
 # Implementing GitHub Advanced Security for Code Scanning