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/securing-aws-iam-permissions/SKILL.md

@@ -1,16 +1,26 @@
 ---
 name: securing-aws-iam-permissions
-description: >
-  This skill guides practitioners through hardening AWS Identity and Access Management
-  configurations to enforce least privilege access across cloud accounts. It covers IAM
-  policy scoping, permission boundaries, Access Analyzer integration, and credential
-  rotation strategies to reduce the blast radius of compromised identities.
+description: 'This skill guides practitioners through hardening AWS Identity and Access Management configurations to enforce
+  least privilege access across cloud accounts. It covers IAM policy scoping, permission boundaries, Access Analyzer integration,
+  and credential rotation strategies to reduce the blast radius of compromised identities.
+
+  '
 domain: cybersecurity
 subdomain: cloud-security
-tags: [aws-iam, least-privilege, permission-boundaries, access-analyzer, cloud-identity]
+tags:
+- aws-iam
+- least-privilege
+- permission-boundaries
+- access-analyzer
+- cloud-identity
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- ID.AM-08
+- GV.SC-06
+- DE.CM-01
 ---
 
 # Securing AWS IAM Permissions