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docs/ROADMAP.md

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+# Roadmap
+
+## Phase 0 — Baseline
+Inspect repository/toolchain, verify Makefile and minimal executable, document
+dependencies. No system changes without permission.
+
+## Phase 1 — C core and offline processing
+Graph data structures, validation, cycle detection, topological ordering,
+preallocated buffers, test oscillator, gain and offline render tests.
+
+## Phase 2 — Real-time backend
+Choose and implement a Linux backend. Document callback semantics, start/stop,
+device errors, shutdown, and safe graph publication.
+
+## Phase 3 — FLTK shell
+Main window, transport controls, view switching, backend status, clean startup
+and shutdown through the C API.
+
+## Phase 4 — Modular editor
+Draw nodes/ports/edges; create, move and connect nodes; reject invalid edges;
+safely submit edits to the C core.
+
+## Phase 5 — Project and sequencer
+Versioned persistence, stable IDs, tracks, clips, timeline, selection, zoom,
+scrolling, and transport synchronization.
+
+## Phase 6 — Audio clips and recording
+Audio import/playback, recording through bounded buffers, missing-asset
+handling, no file I/O in callbacks.
+
+## Phase 7 — MIDI and instrument
+MIDI input/events/clips, simple internal instrument, note-off/panic handling,
+then a basic piano roll.
+
+## Phase 8 — Mixer and editing
+Gain/pan, meters, mute/solo, automation, undo/redo, keyboard workflow.
+
+## Phase 9 — Extensibility and release
+Native node API, evaluate plugin hosting, licensing review, packaging,
+installation tests, performance and recovery tests.
+
+Do not skip phases without documenting why and preserving acceptance criteria.