Phase 4: Add modular graph editor and transactional graph edits

README.md

@@ -20,6 +20,7 @@ This repository is a starter scaffold, not a production DAW. It currently provid
 - an optional JACK-compatible mono backend with start/stop, routing and status;
 - safe control/audio plan handoff and concurrent replacement tests;
 - an optional FLTK shell with engine controls, view switching and backend status;
+- a modular graph editor with transactional edits and live plan adoption status;
 - architecture, format, GUI, roadmap, and decision documents.
 
 The JACK backend has passed software-loopback testing; physical-device playback
@@ -52,10 +53,14 @@ Run the GUI:
 ```
 
 The GUI opens JACK and offers Play/Stop/Reconnect, backend status and view
-switching. Play starts the engine in silence; playback content and editors are
-not implemented. F5 starts, F8 stops, Space toggles, F6 reconnects, and Ctrl+1/2/3
+switching. The initial empty graph is silent. Modular Graph supports adding,
+moving and deleting oscillator/gain/meter/output nodes and connecting ports.
+Sequencer playback and the mixer editor are not implemented. F5 starts, F8 stops, Space toggles, F6 reconnects, and Ctrl+1/2/3
 switches views. Ctrl+Q closes the client and window. No physical ports are
-connected automatically. See [GUI documentation](docs/GUI.md).
+connected automatically. In Modular Graph, drag output to input to connect;
+select a node or wire and press Delete to remove it. Invalid edits leave the
+active graph intact; queued changes are labeled until the engine adopts them.
+See [GUI documentation](docs/GUI.md).
 With JACK development files and an existing JACK-compatible server, run the
 isolated software-loopback test with `make test-jack`. It connects only test
 clients. See [engine documentation](docs/AUDIO_ENGINE.md) for configuration,