The work moved to titan (macOS), where the gate failed for reasons older
than M5a: sockets under macOS's long TMPDIR pass its 104-byte limit,
gatewayd reads /proc/self for its uid, and /tmp is /private/tmp. Task 16
sets TMPDIR=/tmp for every process Cargo runs (.cargo/config.toml [env]),
has gatewayd take its uid from the owner of a pipe it makes (no dependency,
no unsafe), and hands over a toolkit shell.rs that compares resolved paths.
On a scratch tree the gate passes on titan and on talos with 936 tests, and
a wrong uid fails 7 gatewayd tests. Tasks 16 to 19 are renumbered 17 to 20.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
kyleandClaude Opus 5.5
64190c3701