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/http_server.py

@@ -199,7 +199,11 @@ class HttpServer:
             from gateway.status import acquire_scoped_lock
 
             lock_key = f"http:{host}:{port}"
-            if not acquire_scoped_lock("iris", lock_key):
+            # acquire_scoped_lock returns (acquired, existing_record); the
+            # tuple is always truthy, so test the first element (matching
+            # gateway/platforms/base.py's canonical usage).
+            acquired, _ = acquire_scoped_lock("iris", lock_key)
+            if not acquired:
                 logger.warning(
                     "iris: HTTP port %s:%s in use by another profile; server disabled",
                     host,