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## Why Issue #23031 was hard to diagnose from existing `codex doctor` output because support could not see the OS language, resolved Git install, Git repo metadata, Windows console mode/code page, or terminal-title inputs that affect the TUI startup path. This adds those read-only signals to `codex doctor` so Windows, Linux, and macOS reports carry the context needed to investigate similar terminal rendering regressions. Refs #23031 ## What Changed - Add a `system.environment` check for OS type/version, OS language, and locale env vars. - Add a `git.environment` check for the selected Git executable, PATH Git candidates, version, exec path/build options, repository root, branch, `.git` entry, and `core.fsmonitor`. - Add Windows console code page and VT-processing mode details to terminal diagnostics. - Add a `terminal.title` check for configured/default title items and resolved project-title source/value. - Surface startup warning counts in config diagnostics and teach human output to render the new categories. ## How to Test 1. On Windows, check out this branch and run `cargo run -p codex-cli -- doctor --summary`. 2. Confirm the Environment section includes `system`, `git`, `terminal`, and `title` rows. 3. Run `cargo run -p codex-cli -- doctor --json`. 4. Confirm the JSON contains `system.environment`, `git.environment`, and `terminal.title`; on Windows, confirm `terminal.env` details include console code pages and `VT processing` for stdout/stderr. 5. From a non-git directory, run the same `doctor --json` command and confirm the Git check reports `repo detected: false` rather than warning. Targeted tests: - `cargo test -p codex-cli doctor` - `cargo test -p codex-cli`