fix: stabilize flow-test ping endpoint

[plural-copilot]

Summary

• remove the synthetic time-based exception from the /ping handler
• add a focused regression test to keep /ping returning a stable 200 response
• add pytest to project requirements for the new test

Rationale

/ping is currently implemented as deliberate demo logic that raises Exception("unknown internal error") every third second. That directly matches the observed intermittent 500s and explains the Flow 500s alert for flow-test.

This change fixes the root cause by removing the synthetic failure path, which is safer than masking the alert or changing probes while the service is expected to answer /ping successfully.

Validation

• confirmed the intentional failure logic in app/main.py and corresponding note in README.md
• added a regression test for repeated /ping requests
• unable to execute tests in this environment because python3 is unavailable and Docker daemon access is denied

Plural Service: demo-prod/flow-test

[plural-copilot]

This PR was generated by the codex Plural Agent Runtime. Here's some useful information you might want to know to evaluate the ai's perfomance:

Name	Details
💬 Prompt	Investigate and, if safe, fix the root cause of the Flow 500s alert for service flow-test....
🔗 Run history	View run history

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pytest@​9.0.3

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