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-log-forwarding-with-fluentd/SKILL.md

@@ -1,12 +1,25 @@
 ---
 name: implementing-log-forwarding-with-fluentd
-description: Configure Fluentd and Fluent Bit for centralized log aggregation, routing, filtering, and enrichment across distributed infrastructure
+description: Configure Fluentd and Fluent Bit for centralized log aggregation, routing, filtering, and enrichment across distributed
+  infrastructure
 domain: cybersecurity
 subdomain: security-operations
-tags: [fluentd, fluent-bit, log-aggregation, log-forwarding, siem, centralized-logging, observability]
-version: "1.0"
+tags:
+- fluentd
+- fluent-bit
+- log-aggregation
+- log-forwarding
+- siem
+- centralized-logging
+- observability
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.CM-01
+- RS.MA-01
+- GV.OV-01
+- DE.AE-02
 ---
 
 # Implementing Log Forwarding with Fluentd