test: replay seeded events before live ones in run state reconciliation tests

[4pmtong]

Pull Request

Related Issue

Description

Problem. Two tests in test/unit/service/runStateReconciliation.test.ts fail on main:

• "keeps assistant.final distinct from Run completion and receives a later failure"
• "finishes the terminal duration GET while React retires the companion stream"

CI did not catch it because the frontend job runs only the test files a pull request changes, and this file was not changed.

Cause. Since #1969, a Run's companion event stream resumes from the older of the timeline and the Run state it keeps in step with, so that both receive every event. In these tests the Run state comes from a summary, which carries no event sequence, so the stream starts from the beginning and the server would replay events 1 and 2 first. The tests still sent event 3 right away, which the stream correctly treats as a gap.

Fix. Test-only. Both tests now replay the seeded events 1 and 2 before event 3, as the server does, and a helper checks that the stream starts from the beginning. The app code is unchanged.

Testing Evidence (REQUIRED)

• npx vitest run test/unit/service/runStateReconciliation.test.ts: 44 passed (2 failed before).

• ESLint and Prettier pass on the changed file.

• I have included human-verified testing evidence in this PR.

• This PR includes frontend/UI changes, and I attached screenshot(s) or screen recording(s).

• No frontend/UI changes in this PR.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Contribution Guidelines Acknowledgement

• I have read and agree to the Eigent Contribution Guideline

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