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-lateral-movement-detection/SKILL.md

@@ -1,8 +1,9 @@
 ---
 name: performing-lateral-movement-detection
-description: 'Detects lateral movement techniques including Pass-the-Hash, PsExec, WMI execution, RDP pivoting, and SMB-based
-  spreading using SIEM correlation of Windows event logs, network flow data, and endpoint telemetry mapped to MITRE ATT&CK
-  Lateral Movement (TA0008) techniques.
+description: 'Detects lateral movement techniques including Pass-the-Hash, PsExec,
+  WMI execution, RDP pivoting, and SMB-based spreading using SIEM correlation of Windows
+  event logs, network flow data, and endpoint telemetry mapped to MITRE ATT&CK Lateral
+  Movement (TA0008) techniques.
 
   '
 domain: cybersecurity
@@ -31,6 +32,12 @@ nist_csf:
 - DE.AE-02
 - RS.MA-01
 - DE.AE-06
+mitre_attack:
+- T1078
+- T1685.002
+- T1685.005
+- T1566
+- T1021
 ---
 # Performing Lateral Movement Detection