Update gtd.org: mark core skills consolidation DONE

- Merged lisp-validator + lisp-repair → org-skill-lisp-utils.org
- Added lisp utilities: count-char, deterministic-repair, neural-repair
- Moved skills from contrib to core

gtd.org

@@ -146,7 +146,15 @@ Roadmap basis: Evolutionary roadmap from README.org. Working backwards from SOTA
       - Rule 12: Engineering decision audit trail - document root cause, tradeoffs
       - Added to opencortex-contrib/skills/org-skill-engineering-standards.org
 
-**** TODO 4. Advanced CLI Onboarding Experience
+**** DONE 4. Core Skills Consolidation [2026-04-23 Thu]
+      - Merged lisp-validator + lisp-repair → org-skill-lisp-utils.org
+      - Added lisp utilities: count-char, deterministic-repair, neural-repair
+      - Added validation: structural, syntactic, semantic checks
+      - Moved org-skill-self-fix from contrib → core
+      - Moved org-skill-engineering-standards from contrib → core
+      - Deleted old org-skill-lisp-validator.org
+
+**** TODO 5. Advanced CLI Onboarding Experience
 ***** TODO Implement interactive Lisp CLI wizard (=opencortex setup=)
 ***** TODO Implement =opencortex link <gateway>= for Telegram/Signal bot connection
 ***** TODO Implement =opencortex doctor= for environment health and API key validation