chore: convert TODO/FIXME to tracked references (TODO-008)

Convert all remaining raw TODO/FIXME/HACK comments to TRACKED()
references cross-linked to master todo list items. No behavior changes.

crates/chanora_audio/src/audio_event_queue.rs

@@ -24,8 +24,8 @@ pub enum AudioCommand {
     /// Set a client's output volume.
     SetVolume(SessionAudioId, f32),
     /// Remove a client's decode queue.
-    // TODO: Wire to client disconnect path; handled in callback but no
-    // producer currently pushes this command.
+    // TRACKED(TODO-005): Wire to client disconnect path; handled in callback
+    // but no producer currently pushes this command.
     #[allow(dead_code)]
     RemoveClient(SessionAudioId),
 }