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/collecting-threat-intelligence-with-misp/SKILL.md

@@ -1,12 +1,26 @@
 ---
 name: collecting-threat-intelligence-with-misp
-description: MISP (Malware Information Sharing Platform) is an open-source threat intelligence platform for gathering, sharing, storing, and correlating Indicators of Compromise (IOCs) of targeted attacks, threat 
+description: MISP (Malware Information Sharing Platform) is an open-source threat intelligence platform for gathering, sharing,
+  storing, and correlating Indicators of Compromise (IOCs) of targeted attacks, threat
 domain: cybersecurity
 subdomain: threat-intelligence
-tags: [threat-intelligence, cti, ioc, mitre-attack, stix, misp, taxii, threat-sharing]
-version: "1.0"
+tags:
+- threat-intelligence
+- cti
+- ioc
+- mitre-attack
+- stix
+- misp
+- taxii
+- threat-sharing
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- ID.RA-01
+- ID.RA-05
+- DE.CM-01
+- DE.AE-02
 ---
 # Collecting Threat Intelligence with MISP