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-compromised-cloud-credentials/SKILL.md

@@ -1,16 +1,27 @@
 ---
 name: detecting-compromised-cloud-credentials
-description: >
-  Detecting compromised cloud credentials across AWS, Azure, and GCP by analyzing
-  anomalous API activity, impossible travel patterns, unauthorized resource provisioning,
-  and credential abuse indicators using GuardDuty, Defender for Identity, and SCC
-  Event Threat Detection.
+description: 'Detecting compromised cloud credentials across AWS, Azure, and GCP by analyzing anomalous API activity, impossible
+  travel patterns, unauthorized resource provisioning, and credential abuse indicators using GuardDuty, Defender for Identity,
+  and SCC Event Threat Detection.
+
+  '
 domain: cybersecurity
 subdomain: cloud-security
-tags: [cloud-security, credential-compromise, threat-detection, guardduty, incident-response, anomaly-detection]
-version: "1.0"
+tags:
+- cloud-security
+- credential-compromise
+- threat-detection
+- guardduty
+- incident-response
+- anomaly-detection
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- ID.AM-08
+- GV.SC-06
+- DE.CM-01
 ---
 
 # Detecting Compromised Cloud Credentials