chore: remove deprecated and unimplemented code

crates/app/config/plugins.json

@@ -1,4 +1,4 @@
-{
+{
   "preferred_plugin": "mock",
   "fallback_plugins": [
     "whisper",

crates/coldvox-stt/Cargo.toml

@@ -22,7 +22,3 @@ parakeet-rs = { version = "0.2", optional = true }
 [features]
 default = []
 parakeet = ["dep:parakeet-rs"]
-whisper = [] # Placeholder until new backend is implemented
-coqui = []
-leopard = []
-silero-stt = []

crates/coldvox-stt/src/lib.rs

@@ -12,7 +12,6 @@ pub mod plugin;
 pub mod plugin_adapter; // new adapter implementing StreamingStt
 pub mod plugin_types;
 pub mod plugins;
-pub mod processor; // legacy (EventBasedTranscriber-based) processor
 pub mod types;
 
 pub use coldvox_foundation::error::ColdVoxError;