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/executing-active-directory-attack-simulation/SKILL.md

@@ -1,10 +1,12 @@
 ---
 name: executing-active-directory-attack-simulation
-description: 'Executes authorized attack simulations against Active Directory environments to identify misconfigurations,
-  weak credentials, dangerous privilege paths, and exploitable trust relationships that could lead to domain compromise. The
-  tester uses BloodHound for attack path analysis, Mimikatz for credential extraction, and Impacket for protocol-level attacks
-  including Kerberoasting, AS-REP Roasting, and delegation abuse. Activates for requests involving Active Directory pentest,
-  AD attack simulation, domain compromise testing, or Kerberos attack assessment.
+description: 'Executes authorized attack simulations against Active Directory environments
+  to identify misconfigurations, weak credentials, dangerous privilege paths, and
+  exploitable trust relationships that could lead to domain compromise. The tester
+  uses BloodHound for attack path analysis, Mimikatz for credential extraction, and
+  Impacket for protocol-level attacks including Kerberoasting, AS-REP Roasting, and
+  delegation abuse. Activates for requests involving Active Directory pentest, AD
+  attack simulation, domain compromise testing, or Kerberos attack assessment.
 
   '
 domain: cybersecurity
@@ -29,6 +31,12 @@ nist_csf:
 - ID.RA-06
 - GV.OV-02
 - DE.AE-07
+mitre_attack:
+- T1595
+- T1190
+- T1059
+- T1078
+- T1003
 ---
 # Executing Active Directory Attack Simulation