Initial commit: Chatter — assistive-writing app for reMarkable Paper Pro Move

Direct-framebuffer ink pipeline (stock-quality strokes), finger-wipe erase,
growable scrolling canvas with color-ghost cleanup, bidirectional toggle with a
persistent 4-finger return launcher, instant button feedback. Includes prebuilt
aarch64 binaries (dist/), build/deploy/install scripts, a user guide, and a
complete technical reference.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -0,0 +1,42 @@
+cmake_minimum_required(VERSION 3.16)
+project(chatter VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_AUTOMOC ON)
+
+# Per reMarkable's qt_epaper guide: pure Qt Quick (no Qt Widgets).
+find_package(Qt6 REQUIRED COMPONENTS Quick Gui)
+
+qt_standard_project_setup(REQUIRES 6.5)
+
+qt_add_executable(chatter
+    src/main.cpp
+    src/PenDevice.h
+    src/PenDevice.cpp
+    src/AppControl.h
+    src/AppControl.cpp
+    src/InkEngine.h
+    src/InkEngine.cpp
+    src/FbCapture.h
+    src/FbCapture.cpp
+    src/epfb.h
+)
+
+qt_add_qml_module(chatter
+    URI Chatter
+    VERSION 1.0
+    QML_FILES
+        qml/Main.qml
+)
+
+target_link_libraries(chatter PRIVATE
+    Qt6::Quick
+    Qt6::Gui
+    # EPFramebuffer::instance/swapBuffers live in the epaper scenegraph plugin.
+    ${CMAKE_SYSROOT}/usr/lib/plugins/scenegraph/libqsgepaper.so
+)
+
+# Export the executable's dynamic symbols so our setBuffers interposer (in
+# FbCapture.cpp) wins the cross-DSO call from the epaper platform plugin.
+target_link_options(chatter PRIVATE -Wl,--export-dynamic)