Initial FrameAssistant baseline from the vrdashboard template

Template stripped to the overlay platform (examples, demo UI and Frame
test package removed), renamed to FrameAssistant, and working rules for
the project recorded in CLAUDE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/CMakeLists.txt

@@ -0,0 +1,35 @@
+find_package(Qt6 REQUIRED COMPONENTS Test)
+
+# Unit tests run without SteamVR or a headset. They use the "offscreen" QPA platform;
+# tests that need a GPU context QSKIP themselves when none is available.
+
+qt_add_executable(tst_inputbridge tst_inputbridge.cpp)
+target_link_libraries(tst_inputbridge PRIVATE vrdashboard_core Qt6::Test)
+add_test(NAME inputbridge COMMAND tst_inputbridge)
+
+qt_add_executable(tst_render tst_render.cpp)
+target_link_libraries(tst_render PRIVATE vrdashboard_core Qt6::Test)
+qt_add_qml_module(tst_render
+    URI RenderTest
+    VERSION 1.0
+    QML_FILES TwoTone.qml Spinner.qml)
+add_test(NAME render_opengl COMMAND tst_render)
+set_tests_properties(render_opengl PROPERTIES ENVIRONMENT "VRDASH_TEST_API=opengl")
+add_test(NAME render_vulkan COMMAND tst_render)
+set_tests_properties(render_vulkan PROPERTIES ENVIRONMENT "VRDASH_TEST_API=vulkan")
+
+set_tests_properties(inputbridge PROPERTIES ENVIRONMENT "QT_QPA_PLATFORM=offscreen")
+
+# Two surfaces in one app (snapshot mode): set-up, hooks, rendering per surface.
+qt_add_executable(tst_surfaces tst_surfaces.cpp)
+target_link_libraries(tst_surfaces PRIVATE vrdashboard_core)
+qt_add_qml_module(tst_surfaces
+    URI SurfacesTest
+    VERSION 1.0
+    QML_FILES Red.qml Blue.qml)
+add_test(NAME surfaces_opengl COMMAND tst_surfaces --graphics-api opengl)
+add_test(NAME surfaces_vulkan COMMAND tst_surfaces --graphics-api vulkan)
+add_test(NAME surfaces_cli_key COMMAND tst_surfaces --graphics-api opengl)
+set_tests_properties(surfaces_cli_key PROPERTIES ENVIRONMENT "VRDASH_TEST_CLI_KEY=1")
+set_tests_properties(surfaces_opengl surfaces_vulkan surfaces_cli_key
+                     PROPERTIES SKIP_RETURN_CODE 77)