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-secret-scanning-with-gitleaks/SKILL.md

@@ -1,16 +1,27 @@
 ---
 name: implementing-secret-scanning-with-gitleaks
-description: >
-  This skill covers implementing Gitleaks for detecting and preventing hardcoded secrets
-  in git repositories. It addresses configuring pre-commit hooks, CI/CD pipeline integration,
-  custom rule authoring for organization-specific secrets, baseline management for existing
-  repositories, and remediation workflows for exposed credentials.
+description: 'This skill covers implementing Gitleaks for detecting and preventing hardcoded secrets in git repositories.
+  It addresses configuring pre-commit hooks, CI/CD pipeline integration, custom rule authoring for organization-specific secrets,
+  baseline management for existing repositories, and remediation workflows for exposed credentials.
+
+  '
 domain: cybersecurity
 subdomain: devsecops
-tags: [devsecops, cicd, secret-scanning, gitleaks, pre-commit, secure-sdlc]
+tags:
+- devsecops
+- cicd
+- secret-scanning
+- gitleaks
+- pre-commit
+- secure-sdlc
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- GV.SC-07
+- ID.IM-04
+- PR.PS-04
 ---
 
 # Implementing Secret Scanning with Gitleaks