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/reverse-engineering-dotnet-malware-with-dnspy/SKILL.md

@@ -1,17 +1,27 @@
 ---
 name: reverse-engineering-dotnet-malware-with-dnspy
-description: >
-  Reverse engineers .NET malware using dnSpy decompiler and debugger to analyze C#/VB.NET
-  source code, identify obfuscation techniques, extract configurations, and understand
-  malicious functionality including stealers, RATs, and loaders. Activates for requests
-  involving .NET malware analysis, C# malware decompilation, managed code reverse
-  engineering, or .NET obfuscation analysis.
+description: 'Reverse engineers .NET malware using dnSpy decompiler and debugger to analyze C#/VB.NET source code, identify
+  obfuscation techniques, extract configurations, and understand malicious functionality including stealers, RATs, and loaders.
+  Activates for requests involving .NET malware analysis, C# malware decompilation, managed code reverse engineering, or .NET
+  obfuscation analysis.
+
+  '
 domain: cybersecurity
 subdomain: malware-analysis
-tags: [malware, dotnet, reverse-engineering, dnSpy, decompilation]
+tags:
+- malware
+- dotnet
+- reverse-engineering
+- dnSpy
+- decompilation
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.AE-02
+- RS.AN-03
+- ID.RA-01
+- DE.CM-01
 ---
 
 # Reverse Engineering .NET Malware with dnSpy