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/deobfuscating-javascript-malware/SKILL.md

@@ -1,9 +1,10 @@
 ---
 name: deobfuscating-javascript-malware
-description: 'Deobfuscates malicious JavaScript code used in web-based attacks, phishing pages, and dropper scripts by reversing
-  encoding layers, eval chains, string manipulation, and control flow obfuscation to reveal the original malicious logic.
-  Activates for requests involving JavaScript malware analysis, script deobfuscation, web skimmer analysis, or obfuscated
-  dropper investigation.
+description: 'Deobfuscates malicious JavaScript code used in web-based attacks, phishing
+  pages, and dropper scripts by reversing encoding layers, eval chains, string manipulation,
+  and control flow obfuscation to reveal the original malicious logic. Activates for
+  requests involving JavaScript malware analysis, script deobfuscation, web skimmer
+  analysis, or obfuscated dropper investigation.
 
   '
 domain: cybersecurity
@@ -22,6 +23,12 @@ nist_csf:
 - RS.AN-03
 - ID.RA-01
 - DE.CM-01
+mitre_attack:
+- T1027
+- T1027.010
+- T1140
+- T1059.007
+- T1027.006
 ---
 
 # Deobfuscating JavaScript Malware