fix: fix swarm session management integ test.

[JackYPCOnline]

Description

Rewrite this unit test to verify swarm session management behavior.
Now this test resume from where it stopped.

Related Issues

Documentation PR

Type of Change

Bug fix
New feature
Breaking change
Documentation update
Other (please describe):

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

• [ x] I ran hatch run prepare

Checklist

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