feat(cp5): HumanAgent probe path returns typed ProbeResult

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

proteus/agents/human.py

@@ -61,8 +61,10 @@ class HumanAgent(Agent):
         question: str,
         system_prompt: str,
     ) -> ProbeResult:
-        # Implemented in Task 2.
-        raise NotImplementedError
+        self._output(observation)
+        self._output(question)
+        answer = self._input("probe> ").strip()
+        return ProbeResult(answer=answer, reasoning="", raw_text=answer)
 
     def reset(self) -> None:
         return None

tests/agents/test_human.py

@@ -1,5 +1,5 @@
 from proteus.agents import HumanAgent
-from proteus.agents.base import ActResult
+from proteus.agents.base import ActResult, ProbeResult
 
 _ACTIONS = ["up", "down", "left", "right", "stay"]
 
@@ -58,3 +58,22 @@ def test_name_is_human():
 
 def test_reset_is_noop():
     assert HumanAgent().reset() is None
+
+
+def test_probe_returns_typed_answer():
+    out = []
+    agent = HumanAgent(
+        input_fn=_scripted(["the predator is east; go up"]),
+        output_fn=out.append,
+    )
+    result = agent.probe("OBSERVATION", "Where is the predator?", "SYSTEM")
+    assert isinstance(result, ProbeResult)
+    assert result.answer == "the predator is east; go up"
+    assert result.reasoning == ""
+    assert result.raw_text == "the predator is east; go up"
+    assert result.input_tokens == 0
+    assert result.output_tokens == 0
+    assert result.thinking_tokens == 0
+    # Both the observation and the question were shown.
+    assert any("OBSERVATION" in line for line in out)
+    assert any("Where is the predator?" in line for line in out)