v1.0.0: TUI support — resize events, with-terminal macro

- read-event now checks *terminal-resized-p* and returns :resize on SIGWINCH
- Added with-terminal convenience macro (detect → init → body → shutdown)
- Exported *terminal-resized-p* from cl-tty.input package
- Exported with-terminal from cl-tty.backend package
- Updated text-input.org with resize event integration and refactored tests
- Tests: 461 checks, 100% pass (93 input suite, +2 new test cases)

src/backend/classes.lisp

@@ -18,6 +18,37 @@ Called before SIGTSTP or similar suspension. Application should redraw after res
 Called after SIGCONT or similar resume. Re-enables raw mode and backend features.")
   (:method ((b backend)) (values)))
 
+(defmacro with-terminal ((backend-var &optional (cols-var (gensym)) (rows-var (gensym)))
+                         &body body)
+  "Execute BODY with a fully initialized terminal backend.
+
+DETECT-BACKEND, INITIALIZE-BACKEND, and SHUTDOWN-BACKEND are called
+automatically.  The backend instance is bound to BACKEND-VAR.  If
+COLS-VAR and ROWS-VAR are provided, they are bound to the terminal
+dimensions at startup.
+
+The caller should wrap this in SB-POSIX:WITH-RAW-TERMINAL (or
+equivalent) if raw-mode input handling is needed.
+
+Example:
+  (with-terminal (be cols rows)
+    (loop for ev = (read-event be :timeout 0.1)
+          while ev
+          do (format t \"~A~%\" ev))))"
+  (let ((be-sym (gensym "BE"))
+        (c-sym (gensym "COLS"))
+        (r-sym (gensym "ROWS")))
+    `(let* ((,be-sym (detect-backend))
+            (,c-sym (nth-value 0 (backend-size ,be-sym)))
+            (,r-sym (nth-value 1 (backend-size ,be-sym))))
+       (initialize-backend ,be-sym)
+       (unwind-protect
+            (let ((,backend-var ,be-sym)
+                  ,@(when cols-var `((,cols-var ,c-sym)))
+                  ,@(when rows-var `((,rows-var ,r-sym))))
+              ,@body)
+         (shutdown-backend ,be-sym)))))
+
 (defgeneric backend-size (backend)
   (:method ((b backend))
     (values 80 24)))