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-cloud-waf-rules/SKILL.md

@@ -1,17 +1,28 @@
 ---
 name: implementing-cloud-waf-rules
-description: >
-  This skill covers deploying and tuning Web Application Firewall rules on AWS WAF,
-  Azure WAF, and Cloudflare to protect cloud-hosted applications against OWASP Top 10
-  attacks. It details configuring managed rule sets, creating custom rules for business
-  logic protection, implementing rate limiting, deploying bot management, and reducing
-  false positives through rule tuning and logging analysis.
+description: 'This skill covers deploying and tuning Web Application Firewall rules on AWS WAF, Azure WAF, and Cloudflare
+  to protect cloud-hosted applications against OWASP Top 10 attacks. It details configuring managed rule sets, creating custom
+  rules for business logic protection, implementing rate limiting, deploying bot management, and reducing false positives
+  through rule tuning and logging analysis.
+
+  '
 domain: cybersecurity
 subdomain: cloud-security
-tags: [cloud-waf, aws-waf, azure-waf, cloudflare-waf, owasp-protection, rate-limiting]
+tags:
+- cloud-waf
+- aws-waf
+- azure-waf
+- cloudflare-waf
+- owasp-protection
+- rate-limiting
 version: 1.0.0
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- ID.AM-08
+- GV.SC-06
+- DE.CM-01
 ---
 
 # Implementing Cloud WAF Rules