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-dynamic-analysis-with-any-run/SKILL.md

@@ -1,8 +1,10 @@
 ---
 name: performing-dynamic-analysis-with-any-run
-description: 'Performs interactive dynamic malware analysis using the ANY.RUN cloud sandbox to observe real-time execution
-  behavior, interact with malware prompts, and capture process trees, network traffic, and system changes. Activates for requests
-  involving interactive sandbox analysis, cloud-based malware detonation, real-time behavioral observation, or ANY.RUN usage.
+description: 'Performs interactive dynamic malware analysis using the ANY.RUN cloud
+  sandbox to observe real-time execution behavior, interact with malware prompts,
+  and capture process trees, network traffic, and system changes. Activates for requests
+  involving interactive sandbox analysis, cloud-based malware detonation, real-time
+  behavioral observation, or ANY.RUN usage.
 
   '
 domain: cybersecurity
@@ -27,6 +29,12 @@ nist_csf:
 - RS.AN-03
 - ID.RA-01
 - DE.CM-01
+mitre_attack:
+- T1027
+- T1055
+- T1140
+- T1497
+- T1591
 ---
 
 # Performing Dynamic Analysis with ANY.RUN