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-alert-fatigue-reduction/SKILL.md

@@ -1,16 +1,28 @@
 ---
 name: implementing-alert-fatigue-reduction
-description: >
-  Implements strategies to reduce SOC alert fatigue by tuning detection rules, consolidating
-  duplicate alerts, implementing risk-based alerting, and measuring alert quality metrics to
-  maintain analyst effectiveness and prevent critical alert dismissal. Use when SOC teams face
-  overwhelming alert volumes, high false positive rates, or declining analyst performance.
+description: 'Implements strategies to reduce SOC alert fatigue by tuning detection rules, consolidating duplicate alerts,
+  implementing risk-based alerting, and measuring alert quality metrics to maintain analyst effectiveness and prevent critical
+  alert dismissal. Use when SOC teams face overwhelming alert volumes, high false positive rates, or declining analyst performance.
+
+  '
 domain: cybersecurity
 subdomain: soc-operations
-tags: [soc, alert-fatigue, tuning, risk-based-alerting, false-positive, siem, detection-engineering]
-version: "1.0"
+tags:
+- soc
+- alert-fatigue
+- tuning
+- risk-based-alerting
+- false-positive
+- siem
+- detection-engineering
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.CM-01
+- DE.AE-02
+- RS.MA-01
+- DE.AE-06
 ---
 # Implementing Alert Fatigue Reduction