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-api-security-testing-with-42crunch/SKILL.md

@@ -1,12 +1,27 @@
 ---
 name: implementing-api-security-testing-with-42crunch
-description: Implement comprehensive API security testing using the 42Crunch platform to perform static audit and dynamic conformance scanning of OpenAPI specifications.
+description: Implement comprehensive API security testing using the 42Crunch platform to perform static audit and dynamic
+  conformance scanning of OpenAPI specifications.
 domain: cybersecurity
 subdomain: api-security
-tags: [api-security, 42crunch, openapi, api-audit, api-scan, conformance-testing, shift-left, ci-cd-security, owasp-api-top-10]
-version: "1.0"
+tags:
+- api-security
+- 42crunch
+- openapi
+- api-audit
+- api-scan
+- conformance-testing
+- shift-left
+- ci-cd-security
+- owasp-api-top-10
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- ID.RA-01
+- PR.DS-10
+- DE.CM-01
 ---
 
 # Implementing API Security Testing with 42Crunch