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/building-devsecops-pipeline-with-gitlab-ci/SKILL.md

@@ -1,12 +1,26 @@
 ---
 name: building-devsecops-pipeline-with-gitlab-ci
-description: Design and implement a comprehensive DevSecOps pipeline in GitLab CI/CD integrating SAST, DAST, container scanning, dependency scanning, and secret detection.
+description: Design and implement a comprehensive DevSecOps pipeline in GitLab CI/CD integrating SAST, DAST, container scanning,
+  dependency scanning, and secret detection.
 domain: cybersecurity
 subdomain: devsecops
-tags: [gitlab-ci, devsecops, sast, dast, container-scanning, dependency-scanning, secret-detection, cicd-security]
-version: "1.0"
+tags:
+- gitlab-ci
+- devsecops
+- sast
+- dast
+- container-scanning
+- dependency-scanning
+- secret-detection
+- cicd-security
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- GV.SC-07
+- ID.IM-04
+- PR.PS-04
 ---
 
 # Building DevSecOps Pipeline with GitLab CI