Ask for missing lookup subjects without blocking grounded followups

tests/test_search_reference_context.py

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+import pytest
+from src.clean_agent_preview import unbound_lookup_reference
+
+
+@pytest.mark.parametrize('prompt', ['can u look it up', 'please find that', 'what about its price?', 'Could you search for this please?'])
+def test_missing_subject_requires_context(prompt):
+    history = [{'role': 'system', 'content': 'System'}, {'role': 'user', 'content': prompt}]
+    assert unbound_lookup_reference(prompt, history)
+    assert not unbound_lookup_reference(prompt, history, supplied_context=True)
+    prior = [{'role': 'user', 'content': 'I am considering a Firefox phone.'}, {'role': 'assistant', 'content': 'Which features matter?'}]
+    assert not unbound_lookup_reference(prompt, prior + history)
+
+
+@pytest.mark.parametrize('prompt', ['Find the Python documentation', 'Look up this model: WH-1000XM5', 'What about its price compared to a Pixel 9?', 'Search for this https://example.org', 'What is it like living in Japan?', 'helo'])
+def test_explicit_subjects_and_other_intents_keep_normal_routing(prompt):
+    assert not unbound_lookup_reference(prompt, [{'role': 'user', 'content': prompt}])