v1.0.0 release

Bug fixes:
- Fix OSC8 format strings (backslash escape layering) in modern-backend.org
  - Test format string had single backslash instead of double, causing
    unclosed CL string that cascaded through 3 subsequent test forms
  - Implementation format string had leading escaped quote (not a string
    opener) and triple-backslash ending (also not a string terminator)
- Fix missing closing parens in border-char-rounded and border-char-double tests
- Fix ASDF input-tests pathname (file lives in tests/, not src/components/)

New features:
- Implement suspend-backend / resume-backend protocol methods
  - modern-backend: exit/enter alt screen, re-enable mouse/kitty/bracketed-paste
  - simple-backend: no-ops (no terminal state to preserve)

Infrastructure:
- Update test suite to cover suspend/resume (backend + modern-backend suites)
- 454 checks, 100% pass across 14 test suites

cl-tty.asd

@@ -2,7 +2,7 @@
 (asdf:defsystem :cl-tty
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.15.0"
+  :version "1.0.0"
   :license "GPL-3.0"
   :depends-on (:sb-posix)
   :components
@@ -71,7 +71,7 @@
      (:file "dirty-tests")
      (:file "render-tests")
      (:file "theme-tests")
-     (:file "input-tests")
+     (:file "input-tests" :pathname "../../tests/input-tests")
      (:file "scrollbox-tabbar-tests" :pathname "../../tests/scrollbox-tabbar-tests")
      (:file "select-tests" :pathname "../../tests/select-tests")
      (:file "markdown-tests" :pathname "../../tests/markdown-tests")