Wait for in-flight message handlers before ProcessMessagesCoreAsync returns#1403

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Copilot wants to merge 3 commits intomainfrom

copilot/fix-objectdisposedexception

Commits on Feb 28, 2026

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Copilot
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Wait for in-flight message handlers before completing ProcessMessagesCoreAsync

Copilot
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stephentoub
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Reduce test delay from 500ms to 200ms per code review feedback

Copilot
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stephentoub
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