fix(http): test acquire_scoped_lock's bool, not the always-truthy tuple

acquire_scoped_lock returns (acquired, existing_record); the old
'if not acquire_scoped_lock(...)' tested the tuple, which is always
truthy, so the 'port in use by another profile' pre-check never fired
and a conflict surfaced as a generic bind failure. Unpack and test the
first element, matching gateway/platforms/base.py's canonical usage.

Bump VERSION / plugin.yaml to 0.1.3.

gateway-plugin/plugin.yaml

@@ -5,7 +5,7 @@ kind: platform
 # scripts/check_version_sync.sh on commit). This field is the version the
 # gateway advertises in production installs, where only this plugin dir is
 # shipped (see version.py).
-version: 0.1.2
+version: 0.1.3
 description: >
   Native Android / Desktop client gateway adapter for Hermes Agent.
   Runs an HTTP server (optional TLS) inside the gateway; the app connects