fix(session): preserve history across storage relocation

Co-authored-by: lmzopq <1646888+lmzopq@users.noreply.github.com>

conftest.py

@@ -25,14 +25,27 @@ def _isolate_nanobot_log_activation() -> Iterator[None]:
 
 @pytest.fixture(autouse=True)
 def _isolate_sessions_root(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Iterator[None]:
-    """Redirect session storage away from the real ~/.nanobot/sessions.
+    """Redirect session storage away from the real active config data directory.
 
-    Session storage lives under get_legacy_sessions_dir() (outside the workspace,
+    Session storage lives under the active runtime data root (outside the workspace,
     per ADR-0001), so without redirection tests would write into the real home.
     """
-    root = tmp_path / "sessions-root"
-    monkeypatch.setattr("nanobot.session.manager.get_legacy_sessions_dir", lambda: root)
-    monkeypatch.setattr("nanobot.config.paths.get_legacy_sessions_dir", lambda: root)
+    runtime_root = tmp_path.parent / f"{tmp_path.name}-runtime-root"
+    legacy_root = tmp_path.parent / f"{tmp_path.name}-legacy-sessions-root"
+
+    def runtime_subdir(name: str) -> Path:
+        path = runtime_root / name
+        path.mkdir(parents=True, exist_ok=True)
+        return path
+
+    monkeypatch.setattr(
+        "nanobot.session.manager.get_runtime_subdir",
+        runtime_subdir,
+    )
+    monkeypatch.setattr(
+        "nanobot.session.manager.get_legacy_sessions_dir",
+        lambda: legacy_root,
+    )
     yield