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## Why Follow-up to #21180: turn diffs are operation-backed now, but a failed `apply_patch` can still leave exact filesystem mutations behind. For example, a move can write the destination file before failing to remove the source. Treating the whole call as unknowable then drops a change that Codex actually knows happened, so the emitted turn diff can drift from the workspace. ## What changed - [`apply-patch`](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/apply-patch/src/lib.rs#L248-L345) now returns `ApplyPatchFailure` with the exact committed prefix accumulated before an error. If a write failure may already have mutated the target, the delta is marked inexact instead of being reused blindly. - Move handling now records the destination write before attempting source removal, so a partially failed move can still report the destination file that definitely landed ([code](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/apply-patch/src/lib.rs#L463-L521)). - [`ApplyPatchRuntime`](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/core/src/tools/runtimes/apply_patch.rs#L49-L67) now accumulates committed deltas across attempts and forwards them even when the visible tool result is failed or sandbox-denied ([runtime path](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/core/src/tools/runtimes/apply_patch.rs#L223-L250), [event path](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/core/src/tools/events.rs#L215-L225)). - `TurnDiffTracker` now consumes committed exact deltas rather than only fully successful patches; exact-empty failures leave the aggregate unchanged, while inexact deltas still invalidate it. ## Verification - Added a regression test covering a failed move that still emits the committed destination diff: [`apply_patch_failed_move_preserves_committed_destination_diff`](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/core/tests/suite/apply_patch_cli.rs#L1517-L1586). - Kept explicit coverage that an inexact delta clears the aggregate instead of publishing a guessed diff: [`apply_patch_clears_aggregated_diff_after_inexact_delta`](https://github.com/openai/codex/blob/f55724e0276a9b3213170daf2701ccfa0ce22646/codex-rs/core/tests/suite/apply_patch_cli.rs#L1589-L1655). --------- Co-authored-by: Codex <noreply@openai.com>
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