codex-core --test all fails on latest-alpha-cli (168 failures on 0.116.0-alpha.3)

Summary

On untouched upstream/latest-alpha-cli (release 0.116.0-alpha.3), codex-core integration tests fail in my environment.

Repro

1. Checkout upstream commit:

• 0a89d20a364f5ca37f880aa4b38365b97ca66c9e (Release 0.116.0-alpha.3)

1. Run:

• cd codex-rs && cargo test -p codex-core --test all

Observed

test result: FAILED. 604 passed; 168 failed; 16 ignored; 0 measured; 0 filtered out; finished in 107.78s

error: test failed, to rerun pass '-p codex-core --test all'

The failures include large clusters in suites such as:

• suite::apply_patch_cli::*
• suite::shell_serialization::*
• suite::shell_snapshot::*
• suite::tool_harness::*
• suite::undo::*
• suite::unified_exec::*
• suite::view_image::*

Environment

• OS: Linux hpenvyx360 6.18.12+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.18.12-1~bpo13+1 (2026-02-25) x86_64 GNU/Linux
• Rust:
• rustc 1.93.0 (254b59607 2026-01-19)
• host: x86_64-unknown-linux-gnu
• LLVM version: 21.1.8

Happy to provide fuller logs if helpful.