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-kubernetes-pod-security-standards/SKILL.md

@@ -1,12 +1,23 @@
 ---
 name: implementing-kubernetes-pod-security-standards
-description: Pod Security Standards (PSS) define three levels of security policies -- Privileged, Baseline, and Restricted -- enforced by the Pod Security Admission (PSA) controller built into Kubernetes 1.25+. PS
+description: Pod Security Standards (PSS) define three levels of security policies -- Privileged, Baseline, and Restricted
+  -- enforced by the Pod Security Admission (PSA) controller built into Kubernetes 1.25+. PS
 domain: cybersecurity
 subdomain: container-security
-tags: [containers, kubernetes, security, pod-security, PSA]
-version: "1.0"
+tags:
+- containers
+- kubernetes
+- security
+- pod-security
+- PSA
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.PS-01
+- PR.IR-01
+- ID.AM-08
+- DE.CM-01
 ---
 # Implementing Kubernetes Pod Security Standards