Avoid repeated warm request dispatch work

src/linux_fastcgi.cpp

@@ -439,9 +439,13 @@ int handle_cli_complete(FastCGIRequest& request)
 					// been removed, so a unit that still cannot be served by wasm is a
 					// request failure instead of a fallback path.
 					SharedUnit* cli_compile_state = 0;
-					if(!wasm_backend_should_handle(request, cli_unit))
+					bool cli_wasm_ready = wasm_backend_should_handle(request, cli_unit);
+					if(!cli_wasm_ready)
+					{
 						cli_compile_state = get_shared_unit(&request, cli_unit);
-					if(wasm_backend_should_handle(request, cli_unit))
+						cli_wasm_ready = wasm_backend_should_handle(request, cli_unit);
+					}
+					if(cli_wasm_ready)
 					{
 						String wasm_error = wasm_backend_serve(request, cli_unit, "cli");
 						if(wasm_error != "")
@@ -596,8 +600,9 @@ int handle_complete(FastCGIRequest& request) {
 			// be served by wasm becomes a clean 500 request failure.
 			SharedUnit* entry_compile_state = 0;
 			auto wasm_ready = [&](const String& unit) -> bool {
-				if(!wasm_backend_should_handle(request, unit))
-					entry_compile_state = get_shared_unit(&request, unit);
+				if(wasm_backend_should_handle(request, unit))
+					return(true);
+				entry_compile_state = get_shared_unit(&request, unit);
 				return(wasm_backend_should_handle(request, unit));
 			};
 			auto fail_wasm_unavailable = [&](const String& handler) {

src/wasm/backend.cpp

@@ -68,6 +68,10 @@ static String wasm_backend_ensure_started(Request* context)
 	}
 
 	g_wasm_worker = new WasmWorker(wc);
+	// Server configuration is finalized before render workers start. Retain one
+	// native tree so per-request UCEB encoding can reference it without rebuilding
+	// dozens of identical nodes; the guest still decodes it into fresh state.
+	g_wasm_worker->server_config_context = cfg;
 	g_wasm_init_error = g_wasm_worker->init();
 	if(g_wasm_init_error == "")
 		g_wasm_init_error = wasm_worker_prepare(*g_wasm_worker);
@@ -156,7 +160,7 @@ String wasm_backend_serve(Request& request, const String& entry_unit, const Stri
 			ctx[key][entry.first] = entry.second;
 	};
 	if(request.server)
-		copy_map(request.server->config, "server_config");
+		ctx["server_config"].set_reference(&g_wasm_worker->server_config_context);
 	copy_map(request.params, "params");
 	copy_map(request.get, "get");
 	copy_map(request.post, "post");

src/wasm/worker.cpp

@@ -973,6 +973,7 @@ public:
 	std::optional<wasmtime::Module> core_module;
 	std::optional<wasmtime::Linker> core_linker;
 	std::unique_ptr<wasmtime_instance_pre_t, WasmInstancePreDeleter> core_instance_pre;
+	DValue server_config_context;
 	struct CoreImport
 	{
 		String module;