Tighten task steering prompt

Author: jptaylor

src/gradientbang/runtime/subagents/task_agent.py

@@ -1720,7 +1720,8 @@ async def _inject_steering(self, text: str) -> None:
         # with one short priority hint before the raw steer instruction.
         steered_xml = (
             '<event name="task.steered">\n'
-            "Priority update: revise your plan now; follow this over the original task.\n"
+            "Steering update from commander. Apply it immediately; it supersedes "
+            "conflicting parts of the original task.\n"
             f"{cleaned}\n"
             "</event>"
         )

tests/unit/test_task_agent.py

@@ -974,7 +974,8 @@ async def test_steering_emits_replanning_message(self):
         injected = agent._llm_context.add_message.call_args.args[0]
         assert injected["role"] == "user"
         assert injected["content"].startswith('<event name="task.steered">')
-        assert "Priority update: revise your plan now" in injected["content"]
+        assert "Steering update from commander" in injected["content"]
+        assert "supersedes conflicting parts of the original task" in injected["content"]
         assert "Change direction" in injected["content"]
         assert injected["content"].endswith("Change direction\n</event>")