fix: eliminate all compiler warnings across client, relay, web

- Remove unused imports in featherchat.rs (tracing, QualityProfile)
- Remove unused comfort_noise field from CallEncoder (cn_level is used instead)
- Prefix unused _metrics_file in CliArgs
- Prefix unused _addr in Participant
- Remove unused RoomSlot struct and rooms field from web AppState
- Remove unused HashMap import from web main

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-client/src/call.rs

@@ -209,8 +209,6 @@ pub struct CallEncoder {
     timestamp_ms: u32,
     /// Silence detector for suppression.
     silence_detector: SilenceDetector,
-    /// Comfort noise generator for CN packets.
-    comfort_noise: ComfortNoise,
     /// Whether silence suppression is enabled.
     suppression_enabled: bool,
     /// Total frames suppressed (telemetry).
@@ -243,7 +241,6 @@ impl CallEncoder {
                 config.silence_threshold_rms,
                 config.silence_hangover_frames,
             ),
-            comfort_noise: ComfortNoise::new(config.comfort_noise_level),
             suppression_enabled: config.suppression_enabled,
             frames_suppressed: 0,
             cn_counter: 0,

crates/wzp-client/src/cli.rs

@@ -46,7 +46,7 @@ struct CliArgs {
     mnemonic: Option<String>,
     room: Option<String>,
     token: Option<String>,
-    metrics_file: Option<String>,
+    _metrics_file: Option<String>,
 }
 
 impl CliArgs {
@@ -220,7 +220,7 @@ fn parse_args() -> CliArgs {
         mnemonic,
         room,
         token,
-        metrics_file,
+        _metrics_file: metrics_file,
     }
 }
 

crates/wzp-client/src/featherchat.rs

@@ -11,10 +11,7 @@
 //! 5. Connects QUIC to relay for media
 
 use serde::{Deserialize, Serialize};
-use tracing::{error, info};
-
 use wzp_proto::packet::SignalMessage;
-use wzp_proto::QualityProfile;
 
 /// featherChat CallSignal types (mirrors warzone-protocol::message::CallSignalType).
 #[derive(Clone, Debug, Serialize, Deserialize)]

crates/wzp-relay/src/room.rs

@@ -30,7 +30,7 @@ fn next_id() -> ParticipantId {
 /// A participant in a room.
 struct Participant {
     id: ParticipantId,
-    addr: std::net::SocketAddr,
+    _addr: std::net::SocketAddr,
     transport: Arc<wzp_transport::QuinnTransport>,
 }
 
@@ -49,7 +49,7 @@ impl Room {
     fn add(&mut self, addr: std::net::SocketAddr, transport: Arc<wzp_transport::QuinnTransport>) -> ParticipantId {
         let id = next_id();
         info!(room_size = self.participants.len() + 1, participant = id, %addr, "joined room");
-        self.participants.push(Participant { id, addr, transport });
+        self.participants.push(Participant { id, _addr: addr, transport });
         id
     }
 

crates/wzp-web/src/main.rs

@@ -7,7 +7,6 @@
 //!
 //! Rooms: clients connect to /ws/<room-name> and are paired by room.
 
-use std::collections::HashMap;
 use std::net::SocketAddr;
 use std::sync::Arc;
 
@@ -33,19 +32,10 @@ const FRAME_SAMPLES: usize = 960;
 #[derive(Clone)]
 struct AppState {
     relay_addr: SocketAddr,
-    rooms: Arc<Mutex<HashMap<String, RoomSlot>>>,
     auth_url: Option<String>,
     metrics: WebMetrics,
 }
 
-/// A waiting client in a room.
-struct RoomSlot {
-    /// Sender half — send audio TO this waiting client's browser.
-    tx: tokio::sync::mpsc::Sender<Vec<u8>>,
-    /// Receiver half — receive audio FROM this waiting client's browser.
-    rx: Arc<Mutex<tokio::sync::mpsc::Receiver<Vec<i16>>>>,
-}
-
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     tracing_subscriber::fmt().init();
@@ -97,7 +87,6 @@ async fn main() -> anyhow::Result<()> {
     let web_metrics = WebMetrics::new();
     let state = AppState {
         relay_addr,
-        rooms: Arc::new(Mutex::new(HashMap::new())),
         auth_url,
         metrics: web_metrics,
     };