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-rust-malware/SKILL.md

@@ -1,12 +1,25 @@
 ---
 name: reverse-engineering-rust-malware
-description: Reverse engineer Rust-compiled malware using IDA Pro and Ghidra with techniques for handling non-null-terminated strings, crate dependency extraction, and Rust-specific control flow analysis.
+description: Reverse engineer Rust-compiled malware using IDA Pro and Ghidra with techniques for handling non-null-terminated
+  strings, crate dependency extraction, and Rust-specific control flow analysis.
 domain: cybersecurity
 subdomain: malware-analysis
-tags: [rust, reverse-engineering, malware-analysis, ghidra, ida-pro, binary-analysis, rust-malware]
-version: "1.0"
+tags:
+- rust
+- reverse-engineering
+- malware-analysis
+- ghidra
+- ida-pro
+- binary-analysis
+- rust-malware
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.AE-02
+- RS.AN-03
+- ID.RA-01
+- DE.CM-01
 ---
 # Reverse Engineering Rust Malware