v0.8.0: complete cl-tty TUI migration — remove all Croatoan deps

- Replace numeric key code dispatch with cl-tty keyword events
- Replace Croatoan code-key/key-name normalization with direct keyword dispatch
- Update main loop to construct Ctrl-key keywords from cl-tty key-event modifiers
- Remove croatoan-to-tty-event compatibility shim and its test
- Remove duplicate Esc handling from main loop (now handled by on-key)
- Update all documentation contracts, prose, docstrings to remove Croatoan refs
- Remove :croatoan from package dependencies
- All event handling now goes through cl-tty keymaps or keyword dispatch

passepartout.asd

@@ -6,7 +6,7 @@
   :description "The Probabilistic-Deterministic Lisp Machine"
   :depends-on (:usocket :bordeaux-threads :dexador :uiop :cl-dotenv :cl-ppcre :hunchentoot :ironclad :str :cl-json :uuid)
   :serial t
-  :components ((:file "lisp/core-package")
+   :components ((:file "lisp/core-package")
                (:file "lisp/core-skills")
                (:file "lisp/core-transport")
                (:file "lisp/core-memory")
@@ -16,7 +16,7 @@
                (:file "lisp/core-pipeline")))
 
 (defsystem :passepartout/tui
-  :depends-on (:passepartout :croatoan :cl-tty :usocket :bordeaux-threads)
+  :depends-on (:passepartout :cl-tty :usocket :bordeaux-threads)
   :serial t
   :components ((:file "lisp/channel-tui-state")
                (:file "lisp/channel-tui-view")