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/analyzing-api-gateway-access-logs/SKILL.md

@@ -1,17 +1,22 @@
 ---
 name: analyzing-api-gateway-access-logs
-description: 'Parses API Gateway access logs (AWS API Gateway, Kong, Nginx) to detect BOLA/IDOR attacks, rate limit bypass,
-  credential scanning, and injection attempts. Uses pandas for statistical analysis of request patterns and anomaly detection.
+description: 'Parses API Gateway access logs (AWS API Gateway, Kong, Nginx) to detect
+  BOLA/IDOR attacks, rate limit bypass, credential scanning, and injection attempts.
+  Uses pandas for statistical analysis of request patterns and anomaly detection.
   Use when investigating API abuse or building API-specific threat detection rules.
 
   '
 domain: cybersecurity
 subdomain: security-operations
 tags:
-- analyzing
-- api
-- gateway
-- access
+- api-security
+- access-log-analysis
+- aws-api-gateway
+- kong
+- nginx
+- bola-detection
+- rate-limit-bypass
+- security-operations
 version: '1.0'
 author: mahipal
 license: Apache-2.0
@@ -20,6 +25,11 @@ nist_csf:
 - RS.MA-01
 - GV.OV-01
 - DE.AE-02
+mitre_attack:
+- T1190
+- T1110.004
+- T1078.004
+- T1119
 ---
 
 # Analyzing API Gateway Access Logs