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

crates/soundgen-cli/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "soundgen-cli"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "soundgen"
+path = "src/main.rs"
+
+[dependencies]
+soundgen-core.workspace = true
+soundgen-fmt.workspace = true
+soundgen-io.workspace = true
+soundgen-seq.workspace = true
+clap.workspace = true
+serde_json.workspace = true
+
+[dev-dependencies]
+hound.workspace = true