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/performing-soc-tabletop-exercise/SKILL.md

@@ -1,17 +1,33 @@
 ---
 name: performing-soc-tabletop-exercise
-description: >
-  Performs tabletop exercises for SOC teams simulating security incidents through discussion-based
-  scenarios to test incident response procedures, communication workflows, and decision-making
-  under pressure without impacting production systems. Use when organizations need to validate
-  IR playbooks, train analysts, or meet compliance requirements for incident response testing.
+description: 'Performs tabletop exercises for SOC teams simulating security incidents through discussion-based scenarios to
+  test incident response procedures, communication workflows, and decision-making under pressure without impacting production
+  systems. Use when organizations need to validate IR playbooks, train analysts, or meet compliance requirements for incident
+  response testing.
+
+  '
 domain: cybersecurity
 subdomain: soc-operations
-tags: [soc, tabletop, exercise, incident-response, training, nist, playbook-validation]
-mitre_attack: ["T1566", "T1486", "T1078"]
-version: "1.0"
+tags:
+- soc
+- tabletop
+- exercise
+- incident-response
+- training
+- nist
+- playbook-validation
+mitre_attack:
+- T1566
+- T1486
+- T1078
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.CM-01
+- DE.AE-02
+- RS.MA-01
+- DE.AE-06
 ---
 # Performing SOC Tabletop Exercise