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## Summary This PR introduces a gated Bubblewrap (bwrap) Linux sandbox path. The curent Linux sandbox path relies on in-process restrictions (including Landlock). Bubblewrap gives us a more uniform filesystem isolation model, especially explicit writable roots with the option to make some directories read-only and granular network controls. This is behind a feature flag so we can validate behavior safely before making it the default. - Added temporary rollout flag: - `features.use_linux_sandbox_bwrap` - Preserved existing default path when the flag is off. - In Bubblewrap mode: - Added internal retry without /proc when /proc mount is not permitted by the host/container.
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