fix: cap stdin read at 1 MiB to prevent DoS - #3857
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Unbounded sys.stdin.read() allowed a malicious caller to exhaust memory by sending a multi-gigabyte payload. Cap at 1 MiB and raise typer.Exit if truncated.
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Unbounded sys.stdin.read() allowed a malicious caller to exhaust memory by sending a multi-gigabyte payload. Cap at 1 MiB and raise typer.Exit if truncated.