fix(framework): fail the turn on a non-zero claude-code exit#235
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A non-zero exit was only treated as a failure when the agent produced no text. If it streamed some text and then crashed, the driver resolved a result turn and the loop could score the crash as production-grade. Fail on any non-zero exit, surfacing stderr or the partial text as context. Closes #231
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The Claude Code driver only failed a turn on a non-zero exit when the agent produced no text. If it streamed some text and then crashed (exit != 0, or SIGKILL with code null), the driver resolved a result turn and the loop could score the crash as production-grade and stop.
Now any non-zero exit fails the turn, surfacing stderr (else the partial text) as context. Added a regression test.
Closes #231