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/performing-web-application-vulnerability-triage/SKILL.md

@@ -1,12 +1,27 @@
 ---
 name: performing-web-application-vulnerability-triage
-description: Triage web application vulnerability findings from DAST/SAST scanners using OWASP risk rating methodology to separate true positives from false positives and prioritize remediation.
+description: Triage web application vulnerability findings from DAST/SAST scanners using OWASP risk rating methodology to
+  separate true positives from false positives and prioritize remediation.
 domain: cybersecurity
 subdomain: vulnerability-management
-tags: [web-application, vulnerability-triage, owasp, dast, sast, burp-suite, zap, false-positive, risk-rating]
-version: "1.0"
+tags:
+- web-application
+- vulnerability-triage
+- owasp
+- dast
+- sast
+- burp-suite
+- zap
+- false-positive
+- risk-rating
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- ID.RA-01
+- ID.RA-02
+- ID.IM-02
+- ID.RA-06
 ---
 
 # Performing Web Application Vulnerability Triage