Fix/6473 bash reap memory leak - #6528
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…ocesses (esengine#6473) Runaway commands that produce unbounded output (e.g. infinite-loop prints in a Python script) could fill the bytes.Buffer without limit, causing memory to spike to 96% and the Reasonix process to become unresponsive. Add a cappedWriter that silently drops writes beyond 10 MB and appends a truncation notice so the model sees a clear signal that output was cut.
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Summary
Verification
Cache impact
Cache-impact: none — bash tool output buffering only, no prompt or tool definition changes
Cache-guard: go test ./internal/tool/builtin/ -count=1 covers foreground bash execution
System-prompt-review: N/A
For cache-sensitive changes, fill these lines before requesting review:
Cache-impact:none,low,medium, orhigh, plus the reason.Cache-guard: the focused guard test/command added or run, or why an existing guard covers the change.System-prompt-review: required reviewer/approval note when provider-visible system prompt, memory prefix, output style, or skill index behavior changes.