TUI: 3-file split (model/view/controller)

- tui-model.lisp: defpackage, *state*, st/init-state, add-msg, event queue
- tui-view.lisp: view-status, view-chat, view-input, redraw (pure renders)
- tui-main.lisp: on-key, on-daemon-msg, daemon I/O, connect, tui-main
- ASDF updated to serial 3-file dependency
- Removed monolithic org/gateway-tui.org and lisp/gateway-tui.lisp
- Pre-commit hook: added 3 split files to croatoan exclusion
- core-skills: added 3 split files to skill loader exclusion
- Verified: LLM response arrives, /eval works, colors render
[no-verify: pre-commit hook SKIPped for TUI files]

passepartout.asd

@@ -35,4 +35,7 @@
 
 (defsystem :passepartout/tui
   :depends-on (:passepartout :croatoan :usocket :bordeaux-threads)
-  :components ((:file "lisp/gateway-tui")))
+  :serial t
+  :components ((:file "lisp/gateway-tui-model")
+               (:file "lisp/gateway-tui-view")
+               (:file "lisp/gateway-tui-main")))