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## Why `TurnDiffTracker` computes a display root so turn diffs can be rendered repo-relative. For remote exec-server turns, the selected turn `cwd` may exist only inside the selected environment, but `run_turn` was discovering the git root through the local host filesystem. When that lookup failed, nested remote-session diffs fell back to the nested `cwd` and showed `/tmp/...`-prefixed paths instead of repo-relative paths. ## What changed - Resolve the diff display root from the primary selected turn environment when one exists, using that environment's filesystem and `cwd`. - Add `codex_git_utils::get_git_repo_root_with_fs(...)` so git-root discovery can run against an `ExecutorFileSystem`, including remote environments. - Reuse that helper from `resolve_root_git_project_for_trust(...)` and add coverage for `.git` gitdir-pointer detection. ## Validation - Devbox Bazel: `//codex-rs/core:core-unit-tests --test_filter=get_git_repo_root_with_fs_detects_gitdir_pointer` - Devbox Docker-backed remote-env repro: `//codex-rs/core:core-all-test --test_filter=apply_patch_turn_diff_paths_stay_repo_relative_when_session_cwd_is_nested`