ci: add Windows and macOS compatibility smoke jobs

[bagowix]

Summary

• add a lightweight Windows and macOS runtime matrix for Python 3.11 and 3.14
• cover core, concurrency, shutdown, timeout, pipeline, state-machine, typing-surface, and loopback integration behavior
• keep Redis and platform-independent quality gates in the full Ubuntu matrix and document the tested-platform policy

Checklist

• Tests added or updated (suite stays at 100% coverage)
• uv run ruff format --check and uv run ruff check pass
• uv run mypy, uv run pyright and uv run pyrefly check pass
• Docs updated (docs/) for user-facing changes
• CHANGELOG.md [Unreleased] updated
• Commits follow Conventional Commits

Related issues

Closes #86

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📥 Commits

Reviewing files that changed from the base of the PR and between 114bee5 and ac92d90.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• CHANGELOG.md
• CONTRIBUTING.md

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing ci/86-platform-smoke (ac92d90) with main (114bee5)}