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/extracting-browser-history-artifacts/SKILL.md

@@ -1,12 +1,25 @@
 ---
 name: extracting-browser-history-artifacts
-description: Extract and analyze browser history, cookies, cache, downloads, and bookmarks from Chrome, Firefox, and Edge for forensic evidence of user web activity.
+description: Extract and analyze browser history, cookies, cache, downloads, and bookmarks from Chrome, Firefox, and Edge
+  for forensic evidence of user web activity.
 domain: cybersecurity
 subdomain: digital-forensics
-tags: [forensics, browser-forensics, chrome, firefox, edge, web-history, artifact-extraction]
-version: "1.0"
+tags:
+- forensics
+- browser-forensics
+- chrome
+- firefox
+- edge
+- web-history
+- artifact-extraction
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- RS.AN-01
+- RS.AN-03
+- DE.AE-02
+- RS.MA-01
 ---
 
 # Extracting Browser History Artifacts