feat: coordinate authoritative playback and audio routing

controller/models.py

@@ -84,10 +84,38 @@ class PlayerObservation:
     generation: int
     reconciliation_state: str
     reconciliation_due_at: float | None
+    reconciliation_id: str | None
     last_status_at: float | None
     last_telemetry_at: float | None
 
 
+@dataclass(frozen=True)
+class RouterObservation:
+    mode: str | None
+    freshness: str
+    observed_at: float | None
+    last_warning: str | None
+
+
+@dataclass(frozen=True)
+class AudioLeaseRecord:
+    lease_id: str
+    operation_id: str | None
+    playback_generation: int | None
+    state: str
+    previous_mode: str | None
+    target_mode: str
+    restoration_mode: str | None
+    restoration_source: str
+    controller_changed: bool
+    confirmation_deadline: float | None
+    created_at: float
+    acquired_at: float | None
+    released_at: float | None
+    warning: str | None
+    error: str | None
+
+
 @dataclass(frozen=True)
 class MigrationReport:
     migrated: bool