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/implementing-google-workspace-admin-security/SKILL.md

@@ -1,17 +1,28 @@
 ---
 name: implementing-google-workspace-admin-security
-description: >
-  Implements comprehensive Google Workspace security hardening including admin console
-  configuration, phishing-resistant MFA enforcement, DLP policies, email authentication
-  (SPF/DKIM/DMARC), OAuth app control, and external sharing restrictions.
-  Activates for requests involving Google Workspace hardening, G Suite security configuration,
-  or cloud office security administration.
+description: 'Implements comprehensive Google Workspace security hardening including admin console configuration, phishing-resistant
+  MFA enforcement, DLP policies, email authentication (SPF/DKIM/DMARC), OAuth app control, and external sharing restrictions.
+  Activates for requests involving Google Workspace hardening, G Suite security configuration, or cloud office security administration.
+
+  '
 domain: cybersecurity
 subdomain: identity-access-management
-tags: [Google-Workspace, admin-security, MFA, DMARC, DLP, OAuth, cloud-security]
-version: "1.0"
+tags:
+- Google-Workspace
+- admin-security
+- MFA
+- DMARC
+- DLP
+- OAuth
+- cloud-security
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.AA-01
+- PR.AA-02
+- PR.AA-05
+- PR.AA-06
 ---
 
 # Implementing Google Workspace Admin Security