* fix(gateway): skip device pairing for local backend self-connections
When gateway.tls is enabled, sessions_spawn (and other internal
callGateway operations) creates a new WebSocket to the gateway.
The gateway treated this self-connection like any external client
and enforced device pairing, rejecting it with "pairing required"
(close code 1008). This made sub-agent spawning impossible when
TLS was enabled in Docker with bind: "lan".
Skip pairing for connections that are gateway-client self-connections
from localhost with valid shared auth (token/password). These are
internal backend calls (e.g. sessions_spawn, subagent-announce) that
already have valid credentials and connect from the same host.
Closes#30740
* gateway: tighten backend self-pair bypass guard
* tests: cover backend self-pairing local-vs-remote auth path
* changelog: add gateway tls pairing fix credit
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
e1e715c53d