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-hashicorp-vault-dynamic-secrets/SKILL.md

@@ -1,17 +1,28 @@
 ---
 name: implementing-hashicorp-vault-dynamic-secrets
-description: >
-  Implements HashiCorp Vault dynamic secrets engines for database credentials, AWS IAM keys,
-  and PKI certificates with automatic generation, lease management, and credential rotation
-  to eliminate static secrets in application configurations.
-  Activates for requests involving Vault secrets engine configuration, dynamic database
-  credentials, ephemeral cloud credentials, or automated secret rotation.
+description: 'Implements HashiCorp Vault dynamic secrets engines for database credentials, AWS IAM keys, and PKI certificates
+  with automatic generation, lease management, and credential rotation to eliminate static secrets in application configurations.
+  Activates for requests involving Vault secrets engine configuration, dynamic database credentials, ephemeral cloud credentials,
+  or automated secret rotation.
+
+  '
 domain: cybersecurity
 subdomain: identity-access-management
-tags: [HashiCorp-Vault, dynamic-secrets, secrets-management, database-credentials, AWS-secrets, PKI]
-version: "1.0"
+tags:
+- HashiCorp-Vault
+- dynamic-secrets
+- secrets-management
+- database-credentials
+- AWS-secrets
+- PKI
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.AA-01
+- PR.AA-02
+- PR.AA-05
+- PR.AA-06
 ---
 
 # Implementing HashiCorp Vault Dynamic Secrets