## Why
`codex-rs/vendor/bubblewrap` had fallen behind upstream, and upstream
`v0.11.2` is the current Bubblewrap release. The release is a security
update for `CVE-2026-41163`, affecting setuid Bubblewrap builds, and
deprecates setuid support in favor of the default non-setuid build mode.
## What changed
- Refreshed the vendored Bubblewrap sources under
`codex-rs/vendor/bubblewrap` to upstream `v0.11.2`.
- Brought in the upstream `-Dsupport_setuid` build option, which
defaults setuid support off.
- Updated vendored release notes and documentation files included with
Bubblewrap.
## Verification
Not run locally; this PR only refreshes the vendored upstream Bubblewrap
source snapshot.
Upstream release:
https://github.com/containers/bubblewrap/releases/tag/v0.11.2
## Summary
Vendor Bubblewrap into the repo and add minimal build plumbing in
`codex-linux-sandbox` to compile/link it.
## Why
We want to move Linux sandboxing toward Bubblewrap, but in a safe
two-step rollout:
1) vendoring/build setup (this PR),
2) runtime integration (follow-up PR).
## Included
- Add `codex-rs/vendor/bubblewrap` sources.
- Add build-time FFI path in `codex-rs/linux-sandbox`.
- Update `build.rs` rerun tracking for vendored files.
- Small vendored compile warning fix (`sockaddr_nl` full init).
follow up in https://github.com/openai/codex/pull/9938
