Stop faking an event so one caller can consume a presentation

src/toad/transcript_publication.py

@@ -617,7 +617,7 @@ def observe_thread(self, owner: TranscriptPresentation) -> None:
             )
         )
         # The shared status may already be published before this view subscribes.
-        view.thread_observed()
+        view.consume_thread_presentation()
 
     @property
     def reports_coverage(self):

src/toad/widgets/conversation.py

@@ -462,7 +462,10 @@ def arm_thread_read(self) -> None:
         """Capture turn token and client authority for the next observed presentation."""
         self._thread_read = self.agent_binding.thread_read()
 
-    def thread_observed(self, event: core_events.ThreadRowsChanged | None = None) -> None:
+    def thread_observed(self, event: core_events.ThreadRowsChanged) -> None:
+        self.consume_thread_presentation()
+
+    def consume_thread_presentation(self) -> None:
         """Consume this thread's one observed presentation."""
         presentation = self.app.coordination_access.thread_status.open(
             self.status_thread().name