Add drag-and-drop regression test and build targets

README.md

@@ -28,10 +28,15 @@ Load an audio file, slice it into regions (automatically via onset detection or
 Requires CMake 3.22+ and a C++17 compiler.
 
 ```sh
-make        # Fetch JUCE, configure, build, and install (AU + VST3)
+make          # Fetch JUCE, configure, build
+make install  # Build, then copy the plugins to your system directories
 ```
 
-Running `make` with no arguments will fetch JUCE, build Monoslicer in Release mode, copy the AU and VST3 plugins to your system directories, and trigger an Audio Unit rescan.
+`make` only builds — installing to system plugin folders is opt-in via `make install`.
+
+On macOS `make install` copies the AU to `~/Library/Audio/Plug-Ins/Components` and the VST3
+to `~/Library/Audio/Plug-Ins/VST3`, then triggers an Audio Unit rescan. On Linux it copies the
+VST3 bundle to `~/.vst3`.
 
 Individual targets are also available:
 
@@ -39,13 +44,24 @@ Individual targets are also available:
 make fetch      # Clone JUCE 8.0.9
 make configure  # CMake configure
 make build      # Build (Release)
-make install    # Install AU + VST3 to system directories
+make install    # Build, then install (AU + VST3 on macOS, VST3 on Linux)
 ```
 
+### Tests
+
+```sh
+make test
+```
+
+Currently one suite: `Tests/DragAndDropTest.cpp` verifies that dropping an audio file
+onto the editor is discovered and loaded. It uses a real native peer, so it exercises
+the same code path a host does. Tests build in a separate `build-tests/` directory, so
+`make` is unaffected.
+
 ### Clean
 
 ```sh
-make clean
+make clean      # removes build/ and build-tests/
 ```
 
 ## Plugin Formats