Consolidate Odysseus agent harness and tool contracts

tests/test_python_tool_import_paths.py

@@ -0,0 +1,17 @@
+from src.agent_tools.subprocess_tools import _python_with_configured_import_paths
+
+
+def test_python_tool_import_paths_are_opt_in():
+    source = "print('ok')"
+    assert _python_with_configured_import_paths(source, {}) == source
+
+
+def test_python_tool_import_paths_include_only_absolute_configured_roots():
+    wrapped = _python_with_configured_import_paths(
+        "print('ok')",
+        {"ODYSSEUS_PYTHON_TOOL_SITE_PACKAGES": "/vetted/one:relative:/vetted/two"},
+    )
+    assert "'/vetted/one'" in wrapped
+    assert "'/vetted/two'" in wrapped
+    assert "relative" not in wrapped
+    assert "exec(compile(" in wrapped