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/detecting-mobile-malware-behavior/SKILL.md

@@ -1,17 +1,28 @@
 ---
 name: detecting-mobile-malware-behavior
-description: >
-  Detects and analyzes malicious behavior in mobile applications through behavioral analysis,
-  permission abuse detection, network traffic monitoring, and dynamic instrumentation. Use when
-  analyzing suspicious mobile applications for data exfiltration, command-and-control communication,
-  credential stealing, SMS interception, or other malware indicators. Activates for requests involving
-  mobile malware analysis, app behavior monitoring, trojan detection, or suspicious app investigation.
+description: 'Detects and analyzes malicious behavior in mobile applications through behavioral analysis, permission abuse
+  detection, network traffic monitoring, and dynamic instrumentation. Use when analyzing suspicious mobile applications for
+  data exfiltration, command-and-control communication, credential stealing, SMS interception, or other malware indicators.
+  Activates for requests involving mobile malware analysis, app behavior monitoring, trojan detection, or suspicious app investigation.
+
+  '
 domain: cybersecurity
 subdomain: mobile-security
 author: mahipal
-tags: [mobile-security, android, ios, malware-analysis, owasp-mobile, penetration-testing]
+tags:
+- mobile-security
+- android
+- ios
+- malware-analysis
+- owasp-mobile
+- penetration-testing
 version: 1.0.0
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- PR.AA-05
+- ID.RA-01
+- DE.CM-09
 ---
 # Detecting Mobile Malware Behavior