## Background

This is level 4 of 5 and continues the work of the earlier levels. The new files for this level are in `workspace/t4/`. The records from the start are in `workspace/t1/`, and the earlier results are in `workspace/t1/results/` to `workspace/t3/results/`.

## Task

Hi,

Priya forwarded your lists, thank you, that was more than I expected. Product still wants the platform's newer translations in the November build, and Priya means to bring them in the way upstream's own sync does. Before any sync goes into one of my builds I want a gate I can trust.

Upstream relies on their validator, so I want to know what it really does. If it had run the way upstream runs it today on every sync upstream ever received, merged or closed, what would it have blocked, and of what it flags, what would our users really have seen broken and what does no harm? They also changed what it compares a few days after they first built it, and I'd like to know on the same history whether that change was right before we copy either version. Halvard's extracts from upstream's August trouble came with the mirror.

Then give us our own gate, something Priya's team can run on any sync before it is merged, and show me on the same history what it would have done. Yu-ting asked for her reviewers' script check to be part of it; her mail and the data they use came in yesterday.

The gate goes in workspace/t4/results/sync-gate/ and the evaluation in workspace/t4/results/gate-evaluation.xlsx.

Ines

## Input

- `workspace/t1/`: the records supplied with the work (`Documents/`, `Downloads/`, `LibreChat/`, `librechat.ai/`).
- `workspace/t2/`: the files that came with level t2 (`Documents/`, `Downloads/`, `i18next/`).
- `workspace/t3/`: the files that came with level t3 (`Documents/`, `LibreChat/`, `patches/`, `worktrees/`).
- `workspace/t4/`: the files that came with level t4 (`Documents/`, `Downloads/`).
- `workspace/t1/results/`: the results of level t1.
- `workspace/t2/results/`: the results of level t2.
- `workspace/t3/results/`: the results of level t3.

## Output

- `workspace/t4/results/sync-gate`
- `workspace/t4/results/gate-evaluation.xlsx`