Rename cl-tui -> cl-tty, v0.9.0: Dialog System + Toast

Rename: cl-tty avoids naming collision with Quicklisp's cl-tui (naryl/cl-tui,
a cl-charms-based ncurses library). Our project is pure escape-sequence CL.

v0.9.0 adds:
- Dialog base class: modal overlay with backdrop, centered panel, size
  variants (:small/:medium/:large), stack-based management
- Dialog subclasses: alert, confirm, select-dialog, prompt-dialog
- Toast notifications: transient, top-right corner, auto-dismiss,
  colored variants (info/success/warning/error)
- 78 tests total, 100% passing

ASDF: read-time package references (+fiveam:+) replaced with
find-symbol so .asd loads without FiveAM pre-loaded

org/select.org

@@ -1,4 +1,4 @@
-#+TITLE: cl-tui v0.7.0 — Select Dropdown + Fuzzy Filter
+#+TITLE: cl-tty v0.7.0 — Select Dropdown + Fuzzy Filter
 #+STARTUP: content
 
 * Select Widget
@@ -41,10 +41,10 @@ fallback, and category grouping with dimmed headers.
 ** Tests
 
 #+BEGIN_SRC lisp :tangle ../tests/select-tests.lisp
-(defpackage :cl-tui-select-test
-  (:use :cl :fiveam :cl-tui.backend :cl-tui.box :cl-tui.layout :cl-tui.input :cl-tui.select)
+(defpackage :cl-tty-select-test
+  (:use :cl :fiveam :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input :cl-tty.select)
   (:export #:run-tests))
-(in-package #:cl-tui-select-test)
+(in-package #:cl-tty-select-test)
 
 (def-suite select-suite :description "Select widget tests")
 (in-suite select-suite)
@@ -168,8 +168,8 @@ fallback, and category grouping with dimmed headers.
 ** Package
 
 #+BEGIN_SRC lisp
-(defpackage :cl-tui.select
-  (:use :cl :cl-tui.backend :cl-tui.box :cl-tui.layout :cl-tui.input)
+(defpackage :cl-tty.select
+  (:use :cl :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input)
   (:export
    #:select #:make-select
    #:select-options #:select-filter
@@ -191,7 +191,7 @@ plists. ~selected-index~ tracks the currently highlighted option.
 receiving the selected option plist.
 
 #+BEGIN_SRC lisp
-(in-package #:cl-tui.select)
+(in-package #:cl-tty.select)
 
 (defclass select (dirty-mixin)
   ((options :initform nil :initarg :options
@@ -430,7 +430,7 @@ not selectable (visually distinct).
 ** Combined tangle block
 
 #+BEGIN_SRC lisp :tangle ../src/components/select.lisp
-(in-package #:cl-tui.select)
+(in-package #:cl-tty.select)
 
 (defclass select (dirty-mixin)
   ((options :initform nil :initarg :options :accessor select-options :type list)
@@ -527,8 +527,8 @@ not selectable (visually distinct).
 #+END_SRC
 
 #+BEGIN_SRC lisp :tangle ../src/components/select-package.lisp
-(defpackage :cl-tui.select
-  (:use :cl :cl-tui.backend :cl-tui.box :cl-tui.layout :cl-tui.input)
+(defpackage :cl-tty.select
+  (:use :cl :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input)
   (:export
    #:select #:make-select
    #:select-options #:select-filter