fix(test): improve Windows compatibility of the test suite

[beatenevo]

Which issue or RFC does this PR close?

Closes #1308.

Rationale for this change

The PowerContext test suite runs successfully on Windows, but five tests failed.Because they assumed POSIX filesystem behavior, Unix permission bits, the platform default text encoding, or POSIX SQLite path formatting. These failures did not indicate runtime or end-to-end failures. The changes make the existing tests portable across Windows and Mac/Linux without changing production behavior.

What changes are included in this PR?

Area	Windows failure	Change
External Skill scan	Creating a test symlink requires SeCreateSymbolicLinkPrivilege and raised WinError 1314	Handle the missing privilege and continue testing invalid package handling; preserve symlink assertions when available
Codex scope state	Windows stat() does not expose POSIX 0o600 permission bits	Keep the permission assertion on POSIX only
Codex Skill contract	UTF-8 Chinese content was read using the Windows default encoding	Read the Skill file with encoding="utf-8"
Codex recall trace	Windows stat() does not expose POSIX 0o600 permission bits	Keep the permission assertion on POSIX only
SQLite settings	Windows path separators were inserted directly into the expected SQLite URL	Build the expected URL through the existing sqlite_url() helper

No production runtime code, generated API code, or public API was changed.

Are there any user-facing changes?

No. This PR only updates platform-specific test assumptions.

How was this change tested?

Tested on Windows 10 with Python 3.12.4.

• uv sync --link-mode=copy
• uv run python -m pytest tests/builtin/artifacts/skill tests/codex_plugin/test_contract.py tests/codex_plugin/test_recall.py tests/test_server.py -q
  • 78 passed
• uv run python -m pytest tests/e2e -q
  • passed
• uv run python -m pytest --doctest-modules -q -rs
  • 625 passed, 14 skipped
• uv run ruff check tests/builtin/artifacts/skill/test_external.py tests/codex_plugin/test_contract.py tests/codex_plugin/test_recall.py tests/test_server.py
  • passed

The skipped tests require a dedicated OceanBase test database, a configured Vec1 extension, or intentionally cover a POSIX virtual-environment symlink scenario.The test run also emitted intermittent Windows access violation diagnostics,but pytest exited successfully with no test failures.

AI usage statement

OpenAI Codex was used to implement and test these changes.

[CLAassistant]

All committers have signed the CLA.