Addresses review feedback on #381 questioning whether the trap cleanup handler has stale reference issues.

After analysis, no code changes needed. The reviewer is correct: by the time the trap is re-set in each iteration, the previous temp files have already been cleaned via the explicit cleanup call at line 51.

# Each iteration:
stdout_file=$(mktemp)           # 1. Create temp files
stderr_file=$(mktemp)
trap cleanup INT TERM           # 2. Set trap for current files
# ... do work ...
cleanup                         # 3. Clean up before next iteration

The trap only handles signals during the current iteration when the file references are valid.

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