docs(TSP-1386): document Inventor mid-run controls (stop and message queuing)

build/invent/invent.mdx

@@ -36,7 +36,7 @@
     Get a recommendation on tool vs. agent vs. workforce based on your use case.
   </Card>
   <Card title="Build and improve evals" icon="flask-vial" href="/build/agents/build-your-agent/evals">
     Diagnoses errored logs and tools, explains why a run failed, and proposes how to fix it — so you can build stronger evals.
   </Card>
   <Card title="Log bugs to engineering" icon="bug-slash">
     When Inventor hits a platform issue it can't fix, it logs a bug to our engineering team on your behalf.
@@ -141,6 +141,27 @@
   </Step>
 </Steps>
 
+## Controlling a running task
+
+While Inventor is executing a task, two controls let you intervene without waiting for it to finish.
+
+<Tabs>
+  <Tab title="Stop">
+    Click the **Stop** button to immediately cancel the running task. A timeline marker appears in the conversation showing `Stopped after Xs` — where X is the elapsed time in seconds.
+
+    Use stop when Inventor is heading in the wrong direction and you'd rather start fresh with a more specific description than wait for a result you'll discard.
+
+    <Note>
+      Stopping a task automatically dismisses any pending approvals that were waiting on it — you won't need to clear them manually.
+    </Note>
+  </Tab>
+  <Tab title="Send a message mid-run">
+    You can type and send a message while a task is in progress. The message shows a `Queued — will be applied shortly` indicator until Inventor reaches its next step. At that point, Inventor reads the queued message and redirects from there, picking up your new instruction instead of continuing on its current path.
+
+    This lets you correct course or add context without stopping and restarting the task.
+  </Tab>
+</Tabs>
+
 ## Credit usage
 
 <img src="/images/invent-credit-counter.png" alt="The real-time credit counter in the Inventor panel" />