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/deploying-software-defined-perimeter/SKILL.md

@@ -1,12 +1,23 @@
 ---
 name: deploying-software-defined-perimeter
-description: Deploy a Software-Defined Perimeter using the CSA v2.0 specification with Single Packet Authorization, mutual TLS, and SDP controller/gateway configuration to enforce zero trust network access.
+description: Deploy a Software-Defined Perimeter using the CSA v2.0 specification with Single Packet Authorization, mutual
+  TLS, and SDP controller/gateway configuration to enforce zero trust network access.
 domain: cybersecurity
 subdomain: zero-trust-architecture
-tags: [zero-trust, sdp, software-defined-perimeter, network-access, ztna]
-version: "1.0"
+tags:
+- zero-trust
+- sdp
+- software-defined-perimeter
+- network-access
+- ztna
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.AA-01
+- PR.AA-05
+- PR.IR-01
+- GV.PO-01
 ---
 
 # Deploying Software-Defined Perimeter