fix: Swap unit test sleeps with explicit signaling

[zastrowm]

Description

Swap sleeps with explicit signaling so that unit tests are deterministic. Per comment on previous PR: #1453 (comment)

Related Issues

#1453 (comment)

Documentation PR

N/A

Type of Change

Bug fix

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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