v0.5.0: Text input + keybinding system

Four new modules:
- input.lisp: terminal raw mode, escape sequence parser, key/mouse event
  structs, read-event backend integration
- text-input.lisp: single-line text input with cursor, insertion,
  deletion, ctrl-A/E/W/U/K, on-submit callback, max-length
- textarea.lisp: multi-line text input with cursor up/down, newline,
  backspace joins lines, delete, undo/redo stack
- keybindings.lisp: layered keymap dispatch (global/local/focused),
  defkeymap macro, key spec matching with modifier prefixes

60 test assertions, 100% GREEN:
  RED: 0/12, 0/27, 0/30 — no tests existed
  GREEN: 60/60 across backend (27), box (58), input (60)

Dependencies: sb-posix for terminal raw mode (tcgetattr/tcsetattr)
Test files: 30 input tests covering all widgets and keybinding system

cl-tui.asd

@@ -2,9 +2,9 @@
 (asdf:defsystem :cl-tui
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.4.0"
+  :version "0.5.0"
   :license "TBD"
-  :depends-on (:fiveam)
+  :depends-on (:fiveam :sb-posix)
   :components
   ((:module "backend"
     :components
@@ -22,7 +22,13 @@
      (:file "box" :depends-on ("package"))
      (:file "text" :depends-on ("package" "box"))
      (:file "render" :depends-on ("package" "box" "text"))
-     (:file "theme" :depends-on ("package")))))
+     (:file "theme" :depends-on ("package"))
+     ;; Input system (v0.5.0)
+     (:file "input-package" :depends-on ("package"))
+     (:file "input" :depends-on ("input-package" "dirty" "box"))
+     (:file "text-input" :depends-on ("input-package" "input" "box"))
+     (:file "textarea" :depends-on ("input-package" "input" "box"))
+     (:file "keybindings" :depends-on ("input-package" "input")))))
   :in-order-to ((test-op (test-op :cl-tui-tests))))
 
 (asdf:defsystem :cl-tui-tests
@@ -40,6 +46,14 @@
     ((:file "box-tests")
      (:file "dirty-tests")
      (:file "render-tests")
-     (:file "theme-tests"))))
+     (:file "theme-tests")
+     (:file "input-tests"))))
   :perform (test-op (o c)
-             (uiop:symbol-call :cl-tui-backend-test '#:run-tests)))
+             (dolist (suite '((:cl-tui-backend-test "BACKEND-SUITE")
+                              (:cl-tui-box-test "BOX-SUITE")
+                              (:cl-tui-input-test "INPUT-SUITE")))
+               (let* ((pkg (find-package (first suite)))
+                      (s (and pkg (find-symbol (second suite) pkg))))
+                 (when s
+                   (fiveam:explain! (fiveam:run s)))))
+             (uiop:quit 0)))