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/analyzing-linux-elf-malware/SKILL.md

@@ -1,17 +1,27 @@
 ---
 name: analyzing-linux-elf-malware
-description: >
-  Analyzes malicious Linux ELF (Executable and Linkable Format) binaries including botnets,
-  cryptominers, ransomware, and rootkits targeting Linux servers, containers, and cloud
-  infrastructure. Covers static analysis, dynamic tracing, and reverse engineering of
-  x86_64 and ARM ELF samples. Activates for requests involving Linux malware analysis,
-  ELF binary investigation, Linux server compromise assessment, or container malware analysis.
+description: 'Analyzes malicious Linux ELF (Executable and Linkable Format) binaries including botnets, cryptominers, ransomware,
+  and rootkits targeting Linux servers, containers, and cloud infrastructure. Covers static analysis, dynamic tracing, and
+  reverse engineering of x86_64 and ARM ELF samples. Activates for requests involving Linux malware analysis, ELF binary investigation,
+  Linux server compromise assessment, or container malware analysis.
+
+  '
 domain: cybersecurity
 subdomain: malware-analysis
-tags: [malware, Linux, ELF, reverse-engineering, server-malware]
+tags:
+- malware
+- Linux
+- ELF
+- reverse-engineering
+- server-malware
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.AE-02
+- RS.AN-03
+- ID.RA-01
+- DE.CM-01
 ---
 
 # Analyzing Linux ELF Malware