Rewrite srdwm in Rust: working X11 and Wayland backends, Lua config

The C++ prototype (moved to legacy-cpp/) was mostly a design skeleton:
X11 and Windows backends were partially real, Wayland created the
wlroots object graph but never wired a single event listener, macOS
was stub except monitor enumeration, and the Lua engine's srd.bind()
stored a key-combo string but never the actual closure. See
docs/PRIOR_ART.md for the full audit.

This replaces it with a Cargo workspace:

- srdwm-core: platform-independent window/workspace/monitor state,
  a real master-stack tiling layout, and SmartPlacement grid/cascade/
  snap-to-edge placement - fixing several bugs in the C++ version
  (hardcoded 2-column grid, cascade that never cascaded, snap-to-edge
  that always returned a fixed rect). 35 unit tests.
- srdwm-config: the srd Lua API via mlua, implementing the surface
  docs/DEFAULTS.md always documented but the C++ engine never actually
  built (srd.window.close()/focus(direction), srd.workspace.next(),
  real keybinding closures, require("srd") support). 10 unit tests.
- srdwm-x11: a real reparenting WM with a drawn title bar (buttons,
  drag, resize), verified live under Xephyr - frame placement and
  client offset match srdwm-core's computed geometry exactly, and the
  decoration renders correctly on screen.
- srdwm-wayland: a from-scratch smithay compositor (the C++ version
  had nothing working to port from) - runs via the winit backend,
  tracks xdg-shell toplevels through the same WindowManager and
  hit-testing code X11 uses, verified to start/render/run without
  crashing. Decorations are solid-color (no text yet); see
  docs/IMPLEMENTATION_STATUS.md for exact scope.
- srdwm-windows / srdwm-macos: structured, cfg-gated designs informed
  by komorebi/glazewm and yabai/AeroSpace respectively (see
  docs/PRIOR_ART.md), honestly marked as unbuilt/unverified since this
  sandbox has no Windows or macOS target.

5 files changed, 0 insertions, 145 deletions

diff --git a/cmake/Config.cmake.in b/cmake/Config.cmake.in
deleted file mode 100644
index 451c641..0000000
--- a/cmake/Config.cmake.in
+++ /dev/null
@@ -1,24 +0,0 @@
-@PACKAGE_INIT@
-
-include(CMakeFindDependencyMacro)
-
-# Find dependencies
-find_dependency(Lua @Lua_VERSION_STRING@ REQUIRED)
-
-# Include the targets file
-include("${CMAKE_CURRENT_LIST_DIR}/@[email protected]")
-
-# Add include directories
-get_target_property(@PROJECT_NAME@_INCLUDE_DIRS @PROJECT_NAME@::@PROJECT_NAME@ INTERFACE_INCLUDE_DIRECTORIES)
-
-# Add compile definitions
-get_target_property(@PROJECT_NAME@_COMPILE_DEFINITIONS @PROJECT_NAME@::@PROJECT_NAME@ INTERFACE_COMPILE_DEFINITIONS)
-
-# Add compile options
-get_target_property(@PROJECT_NAME@_COMPILE_OPTIONS @PROJECT_NAME@::@PROJECT_NAME@ INTERFACE_COMPILE_OPTIONS)
-
-# Add link libraries
-get_target_property(@PROJECT_NAME@_LINK_LIBRARIES @PROJECT_NAME@::@PROJECT_NAME@ INTERFACE_LINK_LIBRARIES)
-
-# Check if all required targets are available
-check_required_components(@PROJECT_NAME@)
diff --git a/cmake/Uninstall.cmake.in b/cmake/Uninstall.cmake.in
deleted file mode 100644
index 2b630a8..0000000
--- a/cmake/Uninstall.cmake.in
+++ /dev/null
@@ -1,36 +0,0 @@
-if(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
-  message(FATAL_ERROR "Cannot find install manifest: @CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
-endif(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
-
-file(READ "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt" files)
-string(STRIP "${files}" files)
-string(REGEX REPLACE "\n" ";" files "${files}")
-
-foreach(file ${files})
-  message(STATUS "Uninstalling $ENV{DESTDIR}${file}")
-  if(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-    exec_program(
-      "@CMAKE_COMMAND@" ARGS "-E remove \"$ENV{DESTDIR}${file}\""
-      OUTPUT_VARIABLE rm_out
-      RETURN_VALUE rm_retval
-    )
-    if(NOT "${rm_retval}" STREQUAL 0)
-      message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
-    endif(NOT "${rm_retval}" STREQUAL 0)
-  else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-    message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
-  endif(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-endforeach(file)
-
-# Remove empty directories
-file(GLOB_RECURSE dirs "@CMAKE_INSTALL_PREFIX@/*")
-foreach(dir ${dirs})
-  if(IS_DIRECTORY "${dir}")
-    file(GLOB dir_files "${dir}/*")
-    list(LENGTH dir_files num_files)
-    if(num_files EQUAL 0)
-      file(REMOVE_RECURSE "${dir}")
-      message(STATUS "Removed empty directory: ${dir}")
-    endif()
-  endif()
-endforeach()
diff --git a/cmake/macos/Info.plist.in b/cmake/macos/Info.plist.in
deleted file mode 100644
index 0593b12..0000000
--- a/cmake/macos/Info.plist.in
+++ /dev/null
@@ -1,36 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-    <key>CFBundleDevelopmentRegion</key>
-    <string>en</string>
-    <key>CFBundleExecutable</key>
-    <string>${MACOSX_BUNDLE_EXECUTABLE_NAME}</string>
-    <key>CFBundleIconFile</key>
-    <string>${MACOSX_BUNDLE_ICON_FILE}</string>
-    <key>CFBundleIdentifier</key>
-    <string>${MACOSX_BUNDLE_GUI_IDENTIFIER}</string>
-    <key>CFBundleInfoDictionaryVersion</key>
-    <string>6.0</string>
-    <key>CFBundleName</key>
-    <string>${MACOSX_BUNDLE_BUNDLE_NAME}</string>
-    <key>CFBundlePackageType</key>
-    <string>APPL</string>
-    <key>CFBundleShortVersionString</key>
-    <string>${MACOSX_BUNDLE_SHORT_VERSION_STRING}</string>
-    <key>CFBundleVersion</key>
-    <string>${MACOSX_BUNDLE_BUNDLE_VERSION}</string>
-    <key>LSMinimumSystemVersion</key>
-    <string>${MACOSX_DEPLOYMENT_TARGET}</string>
-    <key>NSHumanReadableCopyright</key>
-    <string>${MACOSX_BUNDLE_COPYRIGHT}</string>
-    <key>NSHighResolutionCapable</key>
-    <true/>
-    <key>LSUIElement</key>
-    <true/>
-    <key>LSBackgroundOnly</key>
-    <true/>
-    <key>LSRequiresCarbon</key>
-    <true/>
-</dict>
-</plist>
diff --git a/cmake/macos/Uninstall.cmake.in b/cmake/macos/Uninstall.cmake.in
deleted file mode 100644
index 735fa8a..0000000
--- a/cmake/macos/Uninstall.cmake.in
+++ /dev/null
@@ -1,22 +0,0 @@
-if(NOT EXISTS "@CMAKE_BINARY_DIR@/install_manifest.txt")
-  message(FATAL_ERROR "Cannot find install manifest: @CMAKE_BINARY_DIR@/install_manifest.txt")
-endif(NOT EXISTS "@CMAKE_BINARY_DIR@/install_manifest.txt")
-
-file(READ "@CMAKE_BINARY_DIR@/install_manifest.txt" files)
-string(REGEX REPLACE "\n" ";" "${files}" files)
-list(REVERSE files)
-foreach (file ${files})
-  message(STATUS "Uninstalling $ENV{DESTDIR}${file}")
-  if(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-    exec_program(
-      "@CMAKE_COMMAND@" ARGS "-E remove \"$ENV{DESTDIR}${file}\""
-      OUTPUT_VARIABLE rm_out
-      RETURN_VALUE rm_retval
-      )
-    if(NOT "${rm_retval}" STREQUAL 0)
-      message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
-    endif(NOT "${rm_retval}" STREQUAL 0)
-  else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-    message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
-  endif(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-endforeach(file)
diff --git a/cmake/toolchains/mingw-w64-x86_64.cmake b/cmake/toolchains/mingw-w64-x86_64.cmake
deleted file mode 100644
index 7935b7e..0000000
--- a/cmake/toolchains/mingw-w64-x86_64.cmake
+++ /dev/null
@@ -1,27 +0,0 @@
-# MinGW-w64 x86_64 toolchain file for cross-compiling Windows binaries from Linux
-# Usage:
-#   cmake -S . -B build-win-mingw \
-#     -G Ninja \
-#     -DCMAKE_BUILD_TYPE=Release \
-#     -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/mingw-w64-x86_64.cmake
-
-set(CMAKE_SYSTEM_NAME Windows)
-set(CMAKE_SYSTEM_VERSION 10)
-
-# Adjust these prefixes if your distro uses different triplets
-set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
-
-find_program(CMAKE_C_COMPILER NAMES ${TOOLCHAIN_PREFIX}-gcc)
-find_program(CMAKE_CXX_COMPILER NAMES ${TOOLCHAIN_PREFIX}-g++)
-find_program(CMAKE_RC_COMPILER NAMES ${TOOLCHAIN_PREFIX}-windres)
-
-# For pkg-config in cross environment (optional)
-# set(ENV{PKG_CONFIG_LIBDIR} "")
-# set(ENV{PKG_CONFIG_PATH}   "")
-
-set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX} /usr/${TOOLCHAIN_PREFIX}/${TOOLCHAIN_PREFIX})
-
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)