Contributor-facing "how the client is put together" page?

[CHAPIBUNNY]

When reading the code I mapped how a request travels: Client.send() → _send_handling_auth() (auth flow generator) → _send_handling_redirects() (event hooks, redirects) → _send_single_request() → the transport (HTTPTransport over httpcore by default, or WSGITransport / ASGITransport / MockTransport). AsyncClient mirrors it. The models (Request, Response, Headers, Cookies) live in _models.py, URLs in _urls.py / _urlparse.py, bodies in _content.py / _multipart.py, and decoders in _decoders.py. The apparent import cycles between _models, _types, _exceptions and _config are TYPE_CHECKING-only.

Would a short page like that be useful in the docs (perhaps next to docs/contributing.md)? If it's out of scope, no problem.

Disclosure: I maintain RepoLens, a docs tool, and used it (v1.15.2) for the first map; I checked it against the source by hand.

_{Drafted with RepoLens, checked by hand.}