Map all 754 skills to MITRE ATT&CK v19.1

- Add validated mitre_attack frontmatter to all 754 skills (286 distinct
  techniques), verified against MITRE ATT&CK v19.1 via the official
  mitreattack-python library: 0 revoked, deprecated, or invalid IDs
- Curate precise per-skill technique IDs for forensics, malware-analysis,
  threat-intel, and red-team skills (e.g. DCSync -> T1003.006,
  Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003)
- Reconcile v19.1 tactic restructuring: Defense Evasion split into
  Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.*
  family and T1070.001/.002 remapped to active equivalents (T1685.*)
- Normalize word-split tags across 35 skills (remove filename-derived
  stopword tags, add semantic cybersecurity tags)
- Add api-reference.md for 3 skills that were missing it
- Update README ATT&CK section with accurate v19.1 tactic distribution

skills/performing-static-malware-analysis-with-pe-studio/SKILL.md

@@ -1,9 +1,11 @@
 ---
 name: performing-static-malware-analysis-with-pe-studio
-description: 'Performs static analysis of Windows PE (Portable Executable) malware samples using PEStudio to examine file
-  headers, imports, strings, resources, and indicators without executing the binary. Identifies suspicious characteristics
-  including packing, anti-analysis techniques, and malicious imports. Activates for requests involving static malware analysis,
-  PE file inspection, Windows executable analysis, or pre-execution malware triage.
+description: 'Performs static analysis of Windows PE (Portable Executable) malware
+  samples using PEStudio to examine file headers, imports, strings, resources, and
+  indicators without executing the binary. Identifies suspicious characteristics including
+  packing, anti-analysis techniques, and malicious imports. Activates for requests
+  involving static malware analysis, PE file inspection, Windows executable analysis,
+  or pre-execution malware triage.
 
   '
 domain: cybersecurity
@@ -22,6 +24,12 @@ nist_csf:
 - RS.AN-03
 - ID.RA-01
 - DE.CM-01
+mitre_attack:
+- T1027
+- T1055
+- T1140
+- T1497
+- T0816
 ---
 
 # Performing Static Malware Analysis with PEStudio