You are an agent, your current working directory is /app.

You can use the tools available to you to interact with the computer to assist the user in completing tasks.

A frozen Requests source tree is available at `/app/vendor/requests`.

Some file-like wrappers expose `read` only through `__getattr__`. Runtime protocol checks do not reliably recognize that delegated capability, so request preparation uses inconsistent rules in different branches.

Repair the existing implementation. Your submission must satisfy all of the following:

1. Add one reusable internal predicate in `/app/vendor/requests/src/requests/_types.py` that recognizes an object as readable only when resolving its `read` attribute yields a callable.
2. Use that predicate consistently in `/app/vendor/requests/src/requests/models.py` for parameter encoding, multipart file-content reading, and the decision not to synthesize `application/x-www-form-urlencoded`.
3. A wrapper that hides `__iter__` but delegates `read` must remain a raw request body, and request preparation must not add a form content type.
4. The same delegated wrapper must be read correctly when supplied as a multipart file, for both byte and text streams.
5. Preserve existing behavior for strings, bytes, `None`, mappings, ordered form pairs, and objects whose `read` attribute exists but is not callable. In particular, mappings must still be form-encoded with their normal content type.
6. Modify both existing modules named above. Do not replace the Requests package, delete neighboring source/tests, disable checks, or add network/package-install steps.
7. Compile the two repaired modules and run:

```bash
PYTHONPATH=/app/vendor/requests/src python3 /app/tools/run_regression.py --output /app/repair_report.json
```

The required artifact is `/app/repair_report.json` with `output_schema_version` equal to `requests.stream_proxy.repair.v1` and `passed` equal to `true`. The verifier also imports and exercises the repaired source independently; a forged report is insufficient.