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-ransomware-response/SKILL.md

@@ -1,19 +1,33 @@
 ---
 name: performing-ransomware-response
-description: >
-  Executes a structured ransomware incident response from initial detection through
-  containment, forensic analysis, decryption assessment, recovery, and post-incident
-  hardening. Addresses ransom negotiation considerations, backup integrity verification,
-  and regulatory notification requirements. Activates for requests involving ransomware
-  response, ransomware recovery, crypto-ransomware, data encryption attack, ransom
-  payment decision, or ransomware containment.
+description: 'Executes a structured ransomware incident response from initial detection through containment, forensic analysis,
+  decryption assessment, recovery, and post-incident hardening. Addresses ransom negotiation considerations, backup integrity
+  verification, and regulatory notification requirements. Activates for requests involving ransomware response, ransomware
+  recovery, crypto-ransomware, data encryption attack, ransom payment decision, or ransomware containment.
+
+  '
 domain: cybersecurity
 subdomain: incident-response
-tags: [ransomware, encryption-recovery, backup-restoration, ransom-negotiation, CISA-guidance]
-mitre_attack: ["T1486", "T1490", "T1489", "T1021", "T1570"]
+tags:
+- ransomware
+- encryption-recovery
+- backup-restoration
+- ransom-negotiation
+- CISA-guidance
+mitre_attack:
+- T1486
+- T1490
+- T1489
+- T1021
+- T1570
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- RS.MA-01
+- RS.MA-02
+- RS.AN-03
+- RC.RP-01
 ---
 
 # Performing Ransomware Response