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-ot-vulnerability-scanning-safely/SKILL.md

@@ -1,16 +1,29 @@
 ---
 name: performing-ot-vulnerability-scanning-safely
-description: >
-  Perform vulnerability scanning in OT/ICS environments safely using passive
-  monitoring, native protocol queries, and carefully controlled active scanning
-  with Tenable OT Security to identify vulnerabilities without disrupting
-  industrial processes or crashing legacy controllers.
+description: 'Perform vulnerability scanning in OT/ICS environments safely using passive monitoring, native protocol queries,
+  and carefully controlled active scanning with Tenable OT Security to identify vulnerabilities without disrupting industrial
+  processes or crashing legacy controllers.
+
+  '
 domain: cybersecurity
 subdomain: ot-ics-security
-tags: [ot-security, ics, vulnerability-scanning, tenable, nessus, passive-scanning, risk-management, nist]
-version: "1.0"
+tags:
+- ot-security
+- ics
+- vulnerability-scanning
+- tenable
+- nessus
+- passive-scanning
+- risk-management
+- nist
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- DE.CM-01
+- ID.AM-05
+- GV.OC-02
 ---
 
 # Performing OT Vulnerability Scanning Safely