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-memory-forensics-with-volatility3/SKILL.md

@@ -1,12 +1,24 @@
 ---
 name: performing-memory-forensics-with-volatility3
-description: Analyze volatile memory dumps using Volatility 3 to extract running processes, network connections, loaded modules, and evidence of malicious activity.
+description: Analyze volatile memory dumps using Volatility 3 to extract running processes, network connections, loaded modules,
+  and evidence of malicious activity.
 domain: cybersecurity
 subdomain: digital-forensics
-tags: [forensics, memory-forensics, volatility, ram-analysis, malware-detection, incident-response]
-version: "1.0"
+tags:
+- forensics
+- memory-forensics
+- volatility
+- ram-analysis
+- malware-detection
+- incident-response
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- RS.AN-01
+- RS.AN-03
+- DE.AE-02
+- RS.MA-01
 ---
 
 # Performing Memory Forensics with Volatility 3