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-heap-spray-exploitation/SKILL.md

@@ -1,12 +1,23 @@
 ---
 name: analyzing-heap-spray-exploitation
-description: Detect and analyze heap spray attacks in memory dumps using Volatility3 plugins to identify NOP sled patterns, shellcode landing zones, and suspicious large allocations in process virtual address space.
+description: Detect and analyze heap spray attacks in memory dumps using Volatility3 plugins to identify NOP sled patterns,
+  shellcode landing zones, and suspicious large allocations in process virtual address space.
 domain: cybersecurity
 subdomain: malware-analysis
-tags: [malware-analysis, memory-forensics, heap-spray, volatility3, exploit-analysis]
-version: "1.0"
+tags:
+- malware-analysis
+- memory-forensics
+- heap-spray
+- volatility3
+- exploit-analysis
+version: '1.0'
 author: mahipal
 license: Apache-2.0
+nist_csf:
+- DE.AE-02
+- RS.AN-03
+- ID.RA-01
+- DE.CM-01
 ---
 # Analyzing Heap Spray Exploitation