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## Why Windows sandboxed commands run as a sandbox user, while workspace repositories are usually owned by the real user. The sandbox compensates by injecting a temporary Git `safe.directory` entry into the child environment. That injection was still broken for linked worktrees because the helper followed the `.git` file's `gitdir:` pointer and injected the internal `.git/worktrees/...` location. Git's dubious-ownership check expects the worktree root instead, so sandboxed Git commands still failed in worktree-based Codex checkouts. ## What changed - Treat any `.git` marker, directory or file, as the worktree root for `safe.directory` injection. - Keep the safe-directory logic in `windows-sandbox-rs/src/sandbox_utils.rs` and have the one-shot elevated path reuse it. - Add regression coverage for both normal `.git` directories and gitfile-based worktrees. ## Validation - `cargo test -p codex-windows-sandbox sandbox_utils::tests` - `cargo test -p codex-windows-sandbox` built and ran; the new `sandbox_utils` tests passed, while two pre-existing legacy sandbox tests failed locally with `Access is denied`: `session::tests::legacy_non_tty_cmd_emits_output` and `spawn_prep::tests::legacy_spawn_env_applies_offline_network_rewrite`.