fix: isolate waits and file transfers on sharded H2 pools

Drop the httpcore monkeypatch. Route long-polls (/wait_for_status) and
upload/download onto separate shared H2 bulkhead pools with configurable
shards (default 2), hashed by resource id, so control-plane RPCs keep their
own connection without HTTP/1.1 explosion.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Reflex

src/runloop_api_client/__init__.py

@@ -28,13 +28,8 @@
     APIResponseValidationError,
 )
 from ._base_client import DefaultHttpxClient, DefaultAioHttpClient, DefaultAsyncHttpxClient
-from ._http2_pool_fix import install as _install_http2_pool_fix
 from ._utils._logs import setup_logging as _setup_logging
 
-# Open additional HTTP/2 connections when a connection's stream slots are full
-# instead of blocking on httpcore's per-connection stream semaphore.
-_install_http2_pool_fix()
-
 __all__ = [
     "types",
     "__version__",