Start Docker for Windows tests

[adamtheturtle]

Starts the Docker service in the Windows test job and waits for docker info before running pytest.
This addresses CI failures where the Windows worker reached Docker tests before the daemon pipe was available.
Validated with actionlint and the repository commit/push hooks.

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Note

Low Risk
Low risk CI-only change that adds a wait-for-Docker step on Windows runners; main risk is increased job time or failures if the Docker service is unavailable.

Overview
Adds a Start Docker step to the Windows test workflow to start the Docker Windows service if needed and poll docker info (with a 2-minute timeout) before executing the test suite, reducing flakiness in Docker-dependent tests.

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