connect_timeout is applied per resolved address, not per endpoint

`connect_stream` applies `connect_timeout` **per resolved address**, not per endpoint, contradicting the doc comment ("TCP connect timeout per endpoint attempt"). A hostname resolving to two addresses multiplies every bound: measured 2.0011s for two blackhole addresses at a 1s timeout.

Fix: give `connect_stream` a single total deadline across all resolved addresses, so the timeout bounds the endpoint attempt as documented.

Start by reading connect_stream and its connect_timeout doc comment, then reproduce the two-address case described in the issue to confirm the current per-address timing. Done means one total deadline is shared across all resolved addresses so the endpoint attempt stays within the documented timeout.

Scritto dal modello di indicizzazione a partire dal testo della issue.