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-gdpr-data-subject-access-request/SKILL.md

@@ -1,17 +1,28 @@
 ---
 name: implementing-gdpr-data-subject-access-request
-description: >
-  Automates GDPR Data Subject Access Request (DSAR) workflows including identity verification,
-  PII discovery across databases and files using regex and NER, data mapping, response
-  templating per Article 15 requirements, deadline tracking, and audit logging. Covers
-  ICO/EDPB guidance compliance, exemption handling, and scalable batch processing. Use when
-  building or auditing DSAR response capabilities under GDPR/UK GDPR.
+description: 'Automates GDPR Data Subject Access Request (DSAR) workflows including identity verification, PII discovery across
+  databases and files using regex and NER, data mapping, response templating per Article 15 requirements, deadline tracking,
+  and audit logging. Covers ICO/EDPB guidance compliance, exemption handling, and scalable batch processing. Use when building
+  or auditing DSAR response capabilities under GDPR/UK GDPR.
+
+  '
 domain: cybersecurity
 subdomain: privacy-compliance
-tags: [gdpr, dsar, privacy, pii-discovery, data-subject-rights, compliance, article-15]
-version: "1.0"
+tags:
+- gdpr
+- dsar
+- privacy
+- pii-discovery
+- data-subject-rights
+- compliance
+- article-15
+version: '1.0'
 author: mukul975
 license: Apache-2.0
+nist_csf:
+- GV.PO-01
+- PR.DS-01
+- GV.OC-05
 ---
 
 # Implementing GDPR Data Subject Access Request (DSAR) Workflow