Encode investigation source as contiguous plain-text code blocks

tests/test_project_research.py

@@ -203,7 +203,7 @@ def test_model_loop_uses_project_tools_and_compact_previous_result(tool_case):
             if previous:
                 assert context["evidence"][eid]["content"]["items"]
             assert "inputs" not in context["case"]
-            assert request["prompt_version"]=="investigation_project_v6"
+            assert request["prompt_version"]=="investigation_project_v7"
             reply={"assessment":{"semantic_score":50,"reason":"Scoped fact","evidence_refs":[eid]} if previous else None,
                    "update":{"confidence":"plausible","evidence_refs":[eid] if previous else [],"resolve_questions":[],"add_questions":[],"note":"Query typed identity"},
                    "next":{"kind":"finish","reason":"Check complete"} if previous else {"kind":"tool","operation":"project.query","arguments":rows()}}