test: improve deterministic unit test coverage

tests/command/test_model_command.py

@@ -134,7 +134,15 @@ async def test_model_command_registered_as_exact_and_prefix(tmp_path) -> None:
     out = await router.dispatch(_ctx(loop, "/model fast"))
 
     assert out is not None
-    assert "Switched model preset" in out.content
+    assert out.channel == "cli"
+    assert out.chat_id == "direct"
+    assert out.metadata == {"render_as": "text"}
+    assert out.content == "\n".join([
+        "Switched model preset to `fast`.",
+        "- Model: `openai/gpt-4.1`",
+        "- Context window: 32768",
+        "- Max output tokens: 4096",
+    ])
     assert loop.model_preset == "fast"
 
 
@@ -150,7 +158,10 @@ async def test_goal_command_shows_usage_without_args(tmp_path) -> None:
     loop = _make_loop(tmp_path)
     out = await cmd_goal(_ctx(loop, "/goal"))
     assert out is not None
-    assert "Usage: /goal" in out.content
+    assert out.channel == "cli"
+    assert out.chat_id == "direct"
+    assert out.metadata == {"render_as": "text"}
+    assert out.content == "Usage: /goal <long-running task description>"
 
 
 @pytest.mark.asyncio
@@ -158,7 +169,13 @@ async def test_goal_command_rejects_mid_turn_without_session(tmp_path) -> None:
     loop = _make_loop(tmp_path)
     out = await cmd_goal(_ctx(loop, "/goal do work", args="do work"))
     assert out is not None
-    assert "/stop" in out.content
+    assert out.channel == "cli"
+    assert out.chat_id == "direct"
+    assert out.metadata == {"render_as": "text"}
+    assert out.content == (
+        "A task is already running for this chat. "
+        "Use `/stop` first, then send `/goal <long-running task description>` again."
+    )
 
 
 @pytest.mark.asyncio