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/building-vulnerability-scanning-workflow/SKILL.md

@@ -1,16 +1,30 @@
 ---
 name: building-vulnerability-scanning-workflow
-description: >
-  Builds a structured vulnerability scanning workflow using tools like Nessus, Qualys, and OpenVAS
-  to discover, prioritize, and track remediation of security vulnerabilities across infrastructure.
-  Use when SOC teams need to establish recurring vulnerability assessment processes, integrate
-  scan results with SIEM alerting, and build remediation tracking dashboards.
+description: 'Builds a structured vulnerability scanning workflow using tools like Nessus, Qualys, and OpenVAS to discover,
+  prioritize, and track remediation of security vulnerabilities across infrastructure. Use when SOC teams need to establish
+  recurring vulnerability assessment processes, integrate scan results with SIEM alerting, and build remediation tracking
+  dashboards.
+
+  '
 domain: cybersecurity
 subdomain: soc-operations
-tags: [soc, vulnerability-scanning, nessus, qualys, openvas, cvss, remediation, patch-management]
-version: "1.0"
+tags:
+- soc
+- vulnerability-scanning
+- nessus
+- qualys
+- openvas
+- cvss
+- remediation
+- patch-management
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.CM-01
+- DE.AE-02
+- RS.MA-01
+- DE.AE-06
 ---
 # Building Vulnerability Scanning Workflow