fix: update response status in message-side-effect-service test to avoid a decode error (#322)

Author: abusarah-tech

apps/backend/.artifacts/chat-sync/chat-sync-diagnostics.jsonl

@@ -6,3 +6,6 @@
 {"timestamp":"2026-03-16T14:48:20.247Z","suite":"discord-gateway-dispatch","testCase":"message-create-routing","workerMethod":"ingestMessageCreate","action":"dispatch","dedupeKey":"discord:gateway:create:223456789012345678","syncConnectionId":"00000000-0000-4000-8000-000000000001","expected":"one inbound dispatch for both-direction link","actual":"1 dispatches"}
 {"timestamp":"2026-03-16T14:48:28.056Z","suite":"chat-sync-core-worker.integration","testCase":"hazel-message-create-update-delete","workerMethod":"syncHazelMessageToProvider","action":"create","syncConnectionId":"58d534a7-35af-470d-8a28-89220a0988a3","expected":"synced","actual":"synced"}
 {"timestamp":"2026-03-16T14:48:30.436Z","suite":"chat-sync-core-worker.integration","testCase":"direction-inactive-webhook-origin-guards","workerMethod":"syncHazelMessageCreateToAllConnections","action":"direction_gate","expected":"1 synced","actual":"1 synced"}
+{"timestamp":"2026-06-23T01:00:51.380Z","suite":"discord-gateway-dispatch","testCase":"message-create-routing","workerMethod":"ingestMessageCreate","action":"dispatch","dedupeKey":"discord:gateway:create:223456789012345678","syncConnectionId":"00000000-0000-4000-8000-000000000001","expected":"one inbound dispatch for both-direction link","actual":"1 dispatches"}
+{"timestamp":"2026-06-23T01:00:58.637Z","suite":"chat-sync-core-worker.integration","testCase":"hazel-message-create-update-delete","workerMethod":"syncHazelMessageToProvider","action":"create","syncConnectionId":"f280ff9c-f164-4a1f-974f-baa1d94a2911","expected":"synced","actual":"synced"}
+{"timestamp":"2026-06-23T01:01:00.427Z","suite":"chat-sync-core-worker.integration","testCase":"direction-inactive-webhook-origin-guards","workerMethod":"syncHazelMessageCreateToAllConnections","action":"direction_gate","expected":"1 synced","actual":"1 synced"}

apps/backend/src/services/message-side-effect-service.test.ts

@@ -97,7 +97,7 @@ const workflowClientLayer = (requests: Array<{ url: string }>) =>
 		HttpClient.make((request, url) =>
 			Effect.sync(() => {
 				requests.push({ url: String(url) })
-				return HttpClientResponse.fromWeb(request, new Response(null, { status: 204 }))
+				return HttpClientResponse.fromWeb(request, new Response(null, { status: 200 }))
 			}),
 		),
 	)