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/analyzing-network-packets-with-scapy/SKILL.md

@@ -1,18 +1,24 @@
 ---
 name: analyzing-network-packets-with-scapy
-description: Craft, send, sniff, and dissect network packets using Scapy for protocol analysis, network reconnaissance, and traffic anomaly detection in authorized security testing
+description: Craft, send, sniff, and dissect network packets using Scapy for protocol analysis, network reconnaissance, and
+  traffic anomaly detection in authorized security testing
 domain: cybersecurity
 subdomain: network-security
 tags:
-  - scapy
-  - packet-analysis
-  - network-forensics
-  - protocol-dissection
-  - pcap
-  - traffic-analysis
-version: "1.0"
+- scapy
+- packet-analysis
+- network-forensics
+- protocol-dissection
+- pcap
+- traffic-analysis
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- PR.IR-01
+- DE.CM-01
+- ID.AM-03
+- PR.DS-02
 ---
 
 # Analyzing Network Packets with Scapy