fix IPv6 connection failures with Happy Eyeballs (RFC 8305)

Implement a custom WebSocketTransport that races IPv6 and IPv4 connections
with a 250ms head start for IPv6, matching browser behavior. This prevents
broken IPv6 from blocking all relay connections indefinitely.

This is a temporary fix until the upstream async-wsocket PR is merged:
https://github.com/shadowylab/async-wsocket/pull/42

1 files changed, 3 insertions, 0 deletions

diff --git a/src/lib/mod.rs b/src/lib/mod.rs
index 1229e8c..f839e7f 100644
--- a/src/lib/mod.rs
+++ b/src/lib/mod.rs
@@ -10,6 +10,9 @@ pub mod mbox_parser;
 pub mod push;
 pub mod repo_ref;
 pub mod repo_state;
+// TEMPORARY: Remove when async-wsocket includes Happy Eyeballs support.
+// See src/lib/transport.rs header for full removal instructions.
+pub mod transport;
 pub mod utils;
 
 use anyhow::{Result, anyhow};