fix(test): set USERPROFILE in test-int config_home fixture on Windows

Hundreds of ``test-int/`` tests were failing on Windows CI with
``Project not found: 'main'`` after resolve_data_dir() was simplified
to use ``Path.home()`` directly (#743).

Root cause: ``Path.home()`` reads ``$HOME`` on POSIX and ``%USERPROFILE%``
on Windows. The ``test-int/conftest.py`` ``config_home`` fixture only
monkeypatched ``HOME``, which worked before because
``ConfigManager.data_dir_path`` used ``os.getenv("HOME", Path.home())``
— that preferred ``HOME`` even on Windows. Now that ``Path.home()`` is
called directly, ``USERPROFILE`` wins and the fixture redirects
nothing, so the test data dir falls back to the real user home where
no ``main`` project is configured.

Mirror the pattern already used in ``tests/conftest.py:config_home``:
when running on Windows, also set ``USERPROFILE`` to ``tmp_path`` so
``Path.home()`` sees the redirected location.

No-op on POSIX.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Drew Cain <groksrc@gmail.com>

Author: groksrc

test-int/conftest.py

@@ -307,7 +307,13 @@ async def test_project(config_home, engine_factory) -> Project:
 
 @pytest.fixture
 def config_home(tmp_path, monkeypatch) -> Path:
+    # Patch both HOME and USERPROFILE so Path.home() returns the test dir on
+    # every platform — Path.home() reads HOME on POSIX and USERPROFILE on
+    # Windows, and ConfigManager.data_dir_path now goes through Path.home()
+    # via resolve_data_dir(). Must mirror tests/conftest.py:config_home.
     monkeypatch.setenv("HOME", str(tmp_path))
+    if os.name == "nt":
+        monkeypatch.setenv("USERPROFILE", str(tmp_path))
     # Set BASIC_MEMORY_HOME to the test directory
     monkeypatch.setenv("BASIC_MEMORY_HOME", str(tmp_path / "basic-memory"))
     return tmp_path