What happened?

SendPushNotification does not guarantee that notifications will be sent in the correct order, which can lead to a race condition. This is already happening, as the RunUnitTest action appears to be flaky.

• https://github.com/a2aproject/a2a-js/actions/runs/18750636883 (see top right corner for first two failed attempts)
• https://github.com/a2aproject/a2a-js/actions/runs/17686476400

Relevant log output

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