fix(host): close desktop audio failure gates

src/host/graph.rs

@@ -11,8 +11,8 @@ use super::aec::AecConfig;
 use super::audio::parse_object_serial;
 use super::fanout::FanoutController;
 use super::health;
-use super::observer::Readiness;
 use super::observer::adapter::{FanoutControl, RegistryObserverHandle};
+use super::observer::{Projection, Readiness};
 use super::owned_thread::OwnedThread;
 use super::taint::snapshot::{GlobalId, Serial};
 use crate::common::output::AudioExclusionEvent;
@@ -293,17 +293,9 @@ async fn wait_for_fanout_ready(
 ) -> Result<()> {
     let deadline = Instant::now() + FANOUT_READY_BUDGET;
     loop {
-        if let Some(projection) = observer.latest() {
-            if projection.readiness == Readiness::TimedOut {
-                bail!("registry observer reached its sticky readiness timeout");
-            }
-            let sink_is_current = projection
-                .snapshot
-                .node(Serial(identity.serial))
-                .is_some_and(|node| node.id == GlobalId(identity.global_id));
-            if projection.graph_ready && sink_is_current {
-                return Ok(());
-            }
+        let projection = observer.latest();
+        if fanout_readiness(projection.as_ref(), identity)? {
+            return Ok(());
         }
         if Instant::now() >= deadline {
             bail!(
@@ -315,6 +307,23 @@ async fn wait_for_fanout_ready(
     }
 }
 
+pub(super) fn fanout_readiness(
+    projection: Option<&Projection>,
+    identity: &SinkIdentity,
+) -> Result<bool> {
+    let Some(projection) = projection else {
+        return Ok(false);
+    };
+    if projection.readiness == Readiness::TimedOut {
+        bail!("registry observer reached its sticky readiness timeout");
+    }
+    let sink_is_current = projection
+        .snapshot
+        .node(Serial(identity.serial))
+        .is_some_and(|node| node.id == GlobalId(identity.global_id));
+    Ok(projection.graph_ready && sink_is_current)
+}
+
 impl AudioGraphOwner {
     pub(super) async fn start(
         filter_name: Option<String>,