Make filesystem tests portable on Windows

[attahn]

Replaces hard-coded /tmp paths in the buffer, database, filesystem, environment, and plugin tests with portable temporary paths. The tests now clean up their files and run in the blocking Windows core suite.

This keeps Windows coverage from being skipped because test fixtures assumed a Unix filesystem layout.

Verified with the focused tests on Windows and WSL/Clang, plus 78 Rust tests.

[attahn]

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@attahn: I’ll review the changes, with particular attention to cross-platform temporary-path handling and fixture cleanup.

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📥 Commits

Reviewing files that changed from the base of the PR and between ba73948 and 1cc62b1.

📒 Files selected for processing (7)

• .github/workflows/ci.yml
• CHANGELOG.md
• examples/db_engine/lib.mko
• examples/testing/bufio_test.mko
• examples/testing/file_env_test.mko
• examples/testing/fs_polish_test.mko
• examples/testing/plugin_product_test.mko

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[attahn]

The Windows failure is the existing task-result regression on upstream main: crew_fan_test.mko receives zero from completed tasks. PR #14 restores the Windows join behavior and covers this failure. The filesystem portability tests in this PR pass; I will update this branch after #14 lands so CI can rerun against the corrected baseline.