feat(agents,backends,conversations,frontends,ui): progress thinking is told apart by its agent, raycast reasoning stays collapsed, read_conversation keeps progress

src/beaver_gateway/agents/base.py

@@ -36,3 +36,8 @@ class BaseAgent(BaseModel):
     system_prompt: str
     expose_mcps: tuple[ExposedMcp, ...] = ()
     accept_client_tools: bool = False
+
+    @property
+    def thinking_is_progress(self) -> bool:
+        """Whether non-empty thinking is text for the human rather than reasoning."""
+        return False