feat(transport,tunnel): implement Wave 3 — QUIC transport + split-tunnel router
aura-transport: quinn 0.11 endpoint with HTTP/3 mimicry (ALPN h3/h3-29,
Chrome-like transport params), outer-TLS accept-any (real auth is the inner
Aura handshake), packet padding to HTTPS sizes; AuraServer/AuraClient drive the
proto handshake over a QUIC bidi stream; AuraConnection impls
aura_proto::PacketConnection (full-duplex via Session::split + per-half mutex).
14 tests incl. a real-QUIC loopback end-to-end (crypto+pki+proto+transport).
aura-tunnel: RouteTable (longest-prefix split-tunnel classify), AuraDns
(hickory) host-route registration, AuraRouter over a PacketIo TUN seam +
Arc<dyn PacketConnection>, AuraTun (tun 0.8 unix; wintun cfg-gated Windows).
10 tests (route classify/priority, dst-IP parse, mock router). send_direct is a
v1 stub. Whole workspace: tests green, clippy clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
xah30
c19a6c5586