feat: reapply rust-v0.120.0 customizations

Author: Loongphy

AGENTS.md

@@ -1,3 +1,11 @@
+# Temporary Reapply Guardrails
+
+- Current work on this branch is an upstream reapply / re-implementation for `rust-v0.120.0`.
+- Only implementation code and necessary docs may be changed during this reapply.
+- Do not add or modify any tests or snapshot files as part of this work.
+- Do not run lint / format / auto-fix commands for this reapply, including `cargo fmt`, `just fmt`, `cargo clippy`, or `just fix`.
+- This reapply is considered complete only when the `codex-upstream-reapply` skill acceptance criteria are satisfied.
+
 # Rust/codex-rs
 
 In the codex-rs folder where the rust code lives:

README.md

@@ -2,7 +2,7 @@
 
 An opinionated Codex CLI. This is strictly a personal hobby project, forked from openai/codex.
 
-![Codex build](https://img.shields.io/static/v1?label=codex%20build&message=rust-v0.118.0-b630ce9a4e&color=2ea043)
+![Codex build](https://img.shields.io/static/v1?label=codex%20build&message=rust-v0.120.0-84b1753e1&color=2ea043)
 
 ![TUI](
 https://github.com/user-attachments/assets/127abbc2-cb30-4d6e-8a81-ce707260c045)