feat(plugins): add source-aware evidence and recording timelines

tests/unit/test_plugins.py

@@ -671,6 +671,7 @@ async def test_flash_plugin_images_never_replace_the_mixed_phone_observation(mon
         bindings={name: ("test-plugin", None)},
         tool_names={name},
         last_images={"test-plugin": b"desktop-before"},
+        previous_image=lambda name, args: b"desktop-before",
     )
     monkeypatch.setattr("artemis.plugins.runtime.get_plugin_runtime", lambda ctx: plugins)
     capture = AsyncMock(return_value=("phone-path", b"phone-after", "phone-tree-after"))