Gaoxy v0.11.1

Gaoxy 0.11.1

Fix HTTP/1 peer-close polling at the inclusive max_buffer_bytes boundary
(#11). A full buffer remains
usable for the next keep-alive request. Polling can still observe pending input
or peer closure; an actual excess byte produces :buffer_limit without growing
the retained input buffer beyond its limit.

Callers must retain the returned Plug.Conn after every poll and abort it on
errors. The excess observation consumes one byte, so :buffer_limit is terminal.
No extra application buffer margin is required. Finite I/O, request and shutdown limits,
service resource accounting and HTTP/2 stream isolation remain in force.

All six Hex distributions and the standalone application advance to 0.11.1.
Dependency versions and vendored upstream provenance are unchanged. This patch
adds no deployment or specialist load/pressure qualification.