Stream recipe output in real time#49
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Recipe execution previously captured all output and only stored the last 2000 chars in metadata. This made it impossible to see progress during long-running fits. Replace subprocess.run(capture_output=True) with a streaming Popen wrapper that prints lines as they arrive while still retaining the tail for ExecutionResult metadata. Also sets PYTHONUNBUFFERED=1 in the subprocess environment. Applies to all execution backends: container, local, and venv. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
subprocess.run(capture_output=True)with a streamingPopenwrapper in all recipe execution backends (container, local, venv)PYTHONUNBUFFERED=1in subprocess environment automaticallyExecutionResultmetadataTest plan
prism runlocally and verify output streams line-by-lineExecutionResult.metadatastill contains stdout/stderr tails🤖 Generated with Claude Code
Signed-off-by: lhparker1 liamholdenparker@gmail.com