test(tdx): make stats cache root assertions platform-aware (fix macOS/Linux failures)

[mayaa6]

Summary

Two TDX stats-cache tests hard-code the Windows LOCALAPPDATA cache
layout as the expected default cache root, so they fail on macOS and Linux
even though the code under test is correct.

axdata_source_tdx.stats_cache.user_tdx_stats_cache_root() already returns
the right per-OS location:

OS	Default TDX stats cache root
Windows	%LOCALAPPDATA%\AxData\cache\tdx\stats
macOS	~/Library/Caches/AxData/tdx/stats
Linux	$XDG_CACHE_HOME/axdata/tdx/stats (or ~/.cache/...)

But the tests asserted the Windows path unconditionally:

assert first == (local_app_data / "AxData" / "cache" / "tdx" / "stats").resolve()

On macOS this fails with e.g.:

AssertionError: assert PosixPath('/Users/<you>/Library/Caches/AxData/tdx/stats')
             == PosixPath('/.../local-app-data/AxData/cache/tdx/stats')

Change

Add a small _expected_default_tdx_stats_cache_root() helper that mirrors the
production per-OS branch, and use it in both tests so the expectation follows
the running platform. The Windows expectation is unchanged, and the
cwd-independence assertion (first == second) is untouched.

Affected tests

• tests/test_tdx_source_request_adapter.py::test_tdx_direct_adapter_default_stats_cache_is_independent_of_cwd
• tests/test_tdx_provider_package.py::test_tdx_provider_installed_from_wheel_is_discovered_and_can_route

Verification (macOS, Python 3.12)

Before: both tests fail. After:

$ python -m pytest -q \
    tests/test_tdx_source_request_adapter.py::test_tdx_direct_adapter_default_stats_cache_is_independent_of_cwd \
    tests/test_tdx_provider_package.py::test_tdx_provider_installed_from_wheel_is_discovered_and_can_route
2 passed

No production code changed — this is a test-only, platform-portability fix.

🤖 Generated with Claude Code