Capture Claude failure diagnostics

[zhamborova]

No description provided.

[gemini-code-assist]

Code Review

This pull request enhances error diagnostics in the server pipeline script by capturing and parsing stderr and stream events from the Claude process into temporary files, which are then included in the fallback summary upon failure. The review feedback highlights a potential race condition caused by using asynchronous process substitution to capture stderr, suggesting a synchronous redirection approach instead.

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