Feat: add hidden mode and new documentation

plugins/cagire-plugins/src/lib.rs

@@ -1,3 +1,5 @@
+//! Cagire as a CLAP/VST3 plugin via NIH-plug.
+
 mod editor;
 mod params;
 
@@ -20,6 +22,7 @@ use cagire::engine::{
 use cagire::model::{Dictionary, Rng, Variables};
 use params::CagireParams;
 
+/// Channel bridge between the plugin editor and the audio/sequencer threads.
 pub struct PluginBridge {
     pub cmd_tx: Sender<SeqCommand>,
     pub cmd_rx: Receiver<SeqCommand>,
@@ -37,6 +40,7 @@ struct PendingNoteOff {
     note: u8,
 }
 
+/// NIH-plug plugin implementing sequencer, synthesis, and MIDI I/O.
 pub struct CagirePlugin {
     params: Arc<CagireParams>,
     seq_state: Option<SequencerState>,