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/performing-network-packet-capture-analysis/SKILL.md

@@ -1,12 +1,29 @@
 ---
 name: performing-network-packet-capture-analysis
-description: Perform forensic analysis of network packet captures (PCAP/PCAPNG) using Wireshark, tshark, and tcpdump to reconstruct network communications, extract transferred files, identify malicious traffic, and establish evidence of data exfiltration or command-and-control activity.
+description: Perform forensic analysis of network packet captures (PCAP/PCAPNG) using Wireshark, tshark, and tcpdump to reconstruct
+  network communications, extract transferred files, identify malicious traffic, and establish evidence of data exfiltration
+  or command-and-control activity.
 domain: cybersecurity
 subdomain: digital-forensics
-tags: [pcap, wireshark, tshark, tcpdump, network-forensics, packet-capture, protocol-analysis, traffic-analysis, pcapng, network-evidence]
-version: "1.0"
+tags:
+- pcap
+- wireshark
+- tshark
+- tcpdump
+- network-forensics
+- packet-capture
+- protocol-analysis
+- traffic-analysis
+- pcapng
+- network-evidence
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- RS.AN-01
+- RS.AN-03
+- DE.AE-02
+- RS.MA-01
 ---
 
 # Performing Network Packet Capture Analysis