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-sso-configuration/SKILL.md

@@ -1,12 +1,24 @@
 ---
 name: implementing-google-workspace-sso-configuration
-description: Configure SAML 2.0 single sign-on for Google Workspace with a third-party identity provider, enabling centralized authentication and enforcing organization-wide access policies.
+description: Configure SAML 2.0 single sign-on for Google Workspace with a third-party identity provider, enabling centralized
+  authentication and enforcing organization-wide access policies.
 domain: cybersecurity
 subdomain: identity-access-management
-tags: [google-workspace, sso, saml, identity-provider, authentication, federation]
-version: "1.0"
+tags:
+- google-workspace
+- sso
+- saml
+- identity-provider
+- authentication
+- federation
+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 SSO Configuration