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-infrastructure-as-code-security-scanning/SKILL.md

@@ -1,17 +1,29 @@
 ---
 name: implementing-infrastructure-as-code-security-scanning
-description: >
-  This skill covers implementing automated security scanning for Infrastructure as Code
-  (IaC) templates using tools like Checkov, tfsec, and KICS. It addresses detecting
-  misconfigurations in Terraform, CloudFormation, Kubernetes manifests, and Helm charts
-  before deployment, establishing policy-based governance, and integrating IaC scanning
-  into CI/CD pipelines to prevent insecure cloud resource provisioning.
+description: 'This skill covers implementing automated security scanning for Infrastructure as Code (IaC) templates using
+  tools like Checkov, tfsec, and KICS. It addresses detecting misconfigurations in Terraform, CloudFormation, Kubernetes manifests,
+  and Helm charts before deployment, establishing policy-based governance, and integrating IaC scanning into CI/CD pipelines
+  to prevent insecure cloud resource provisioning.
+
+  '
 domain: cybersecurity
 subdomain: devsecops
-tags: [devsecops, cicd, iac-security, checkov, tfsec, terraform, secure-sdlc]
+tags:
+- devsecops
+- cicd
+- iac-security
+- checkov
+- tfsec
+- terraform
+- 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 Infrastructure as Code Security Scanning