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-conduit-security-for-ot-remote-access/SKILL.md

@@ -1,16 +1,29 @@
 ---
 name: implementing-conduit-security-for-ot-remote-access
-description: >
-  Implement secure conduit architecture for OT remote access following IEC 62443
-  zones and conduits model, deploying jump servers, MFA-enabled gateways, session
-  recording, and approval-based workflows to control vendor and engineer access
+description: 'Implement secure conduit architecture for OT remote access following IEC 62443 zones and conduits model, deploying
+  jump servers, MFA-enabled gateways, session recording, and approval-based workflows to control vendor and engineer access
   to industrial control systems without exposing OT networks directly.
+
+  '
 domain: cybersecurity
 subdomain: ot-ics-security
-tags: [ot-security, ics, remote-access, iec62443, jump-server, zero-trust, conduit, mfa]
-version: "1.0"
+tags:
+- ot-security
+- ics
+- remote-access
+- iec62443
+- jump-server
+- zero-trust
+- conduit
+- mfa
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- DE.CM-01
+- ID.AM-05
+- GV.OC-02
 ---
 
 # Implementing Conduit Security for OT Remote Access