Initial release: 8-bit sound synthesizer with LLM/MCP integration

Soundgen is a Rust workspace for generating 8-bit/chiptune sound effects,
UI sounds, and ambient textures for game audio assets. It features JSON-first
sound specs, an MCP server for LLM tool-use, an egui GUI editor, and a
runtime library with NES-authentic DAC emulation.

Features:
- 6 voice types: pulse, triangle, noise, DPCM, wavetable, FM
- Effects: ADSR envelope, frequency sweep, biquad filter, vibrato
- 13 built-in presets (SFX/UI/ambient) as JSON data files
- MCP server: list_presets, generate_sfx, render_sound tools
- Pattern-based sequencer (JSON song format)
- egui GUI: virtual keyboard, preset browser, channel editor, undo/redo
- Runtime: NES nonlinear DAC + SoundBank for game embedding
- 90 tests, 0 warnings

Crates:
- soundgen-core: synthesis engine (no I/O)
- soundgen-fmt: SoundSpec JSON schema + PresetRegistry
- soundgen-io: WAV writer + audio playback
- soundgen-seq: sequencer (patterns, songs)
- soundgen-cli: gen/render/render-song/list-presets
- soundgen-mcp: MCP server for LLM integration
- soundgen-gui: egui editor
- soundgen-runtime: NES DAC + SoundBank

Cargo.toml

@@ -0,0 +1,34 @@
+[workspace]
+members = [
+    "crates/soundgen-core",
+    "crates/soundgen-fmt",
+    "crates/soundgen-io",
+    "crates/soundgen-seq",
+    "crates/soundgen-cli",
+    "crates/soundgen-mcp",
+    "crates/soundgen-gui",
+    "crates/soundgen-runtime",
+]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+repository = "https://github.com/emil/soundgen"
+
+[workspace.dependencies]
+soundgen-core = { path = "crates/soundgen-core" }
+soundgen-fmt = { path = "crates/soundgen-fmt" }
+soundgen-io = { path = "crates/soundgen-io" }
+soundgen-seq = { path = "crates/soundgen-seq" }
+soundgen-runtime = { path = "crates/soundgen-runtime" }
+
+hound = "3"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+clap = { version = "4", features = ["derive"] }
+cpal = "0.15"
+eframe = "0.28"
+egui = "0.28"
+egui-file-dialog = "0.6"