File role: Lazy loading + startup tracing + pure proxy
L10-17: The startup trace logs are only enabled if the environment variable OPENCLAW_GATEWAY_STARTUP_TRACE is set in process.env.
L19-28: Asynchronously lazy‑loads the server.impl.js module. After the module is actually loaded, it enables trace logging. The key point worth emphasizing here is the "lazy loading" design intent – server.impl.ts is 330KB, and importing it directly would cause a full‑load during the module resolution phase. By using await import() inside an async function, the module is only loaded when the Gateway is about to start, reducing I/O pressure during cold start. Additionally, the finally block ensures that a trace is recorded regardless of whether the import succeeds or fails – making it easier to pinpoint which phase a hang occurs in during debugging.
L31-36: Actually loads server.impl.js and starts the Gateway.
L34: (await loadServerImpl()).startGatewayServer(...args) – there's a small detail here: loadServerImpl() itself does not execute anything inside server.impl; it is only responsible for import + trace recording.
L35: The actual Gateway startup is performed by the returned object's .startGatewayServer() method.
L39-42: After the server starts, it exposes an interface for the test framework – the interface is named resetModelCatalogCacheForTest.
L40: Note that this also first calls await loadServerImpl() – meaning that even resetting the model catalog in a test triggers a lazy load of server.impl. However, this is fine in a test scenario because the test is going to start the Gateway anyway.
L41: Pure test utility interface.
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