Rootless Docker cannot set RLIMIT_NOFILE to 1048576 on all hosts
(notably Arch Linux with Docker 29), causing container creation to
fail with "error setting rlimit type 7: operation not permitted".
65536 is a safe value that works across all supported platforms.
Closes GRM-158
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
