fix route grouping and codex websocket regressions

src/server/transformers/openai/responses/compatibility.ts

@@ -217,7 +217,13 @@ export function buildResponsesCompatibilityBodies(
     if (instructions !== null) richCandidate.instructions = instructions;
 
     const passthroughFields = [
+      'parallel_tool_calls',
+      'include',
       'reasoning',
+      'previous_response_id',
+      'truncation',
+      'text',
+      'service_tier',
       'safety_identifier',
       'max_tool_calls',
       'prompt_cache_key',

src/server/transformers/openai/responses/conversion.test.ts

@@ -853,6 +853,7 @@ describe('convertResponsesBodyToOpenAiBody', () => {
       model: 'gpt-5',
       input: 'hello',
       stream: true,
+      parallel_tool_calls: true,
       include: ['reasoning.encrypted_content'],
       reasoning: {
         effort: 'high',
@@ -864,12 +865,20 @@ describe('convertResponsesBodyToOpenAiBody', () => {
       prompt_cache_retention: { scope: 'workspace' },
       background: true,
       top_logprobs: 2,
+      previous_response_id: 'resp_prev_9',
+      truncation: 'auto',
+      service_tier: 'priority',
+      text: {
+        verbosity: 'high',
+      },
     });
 
     expect(candidates).toContainEqual({
       model: 'gpt-5',
       input: 'hello',
       stream: true,
+      parallel_tool_calls: true,
+      include: ['reasoning.encrypted_content'],
       reasoning: {
         effort: 'high',
         summary: 'auto',
@@ -880,6 +889,12 @@ describe('convertResponsesBodyToOpenAiBody', () => {
       prompt_cache_retention: { scope: 'workspace' },
       background: true,
       top_logprobs: 2,
+      previous_response_id: 'resp_prev_9',
+      truncation: 'auto',
+      service_tier: 'priority',
+      text: {
+        verbosity: 'high',
+      },
     });
   });
 

src/server/transformers/openai/responses/proxyStream.ts

@@ -21,6 +21,7 @@ type ResponsesProxyStreamResult = {
 type ResponsesProxyStreamSessionInput = {
   modelName: string;
   successfulUpstreamPath: string;
+  strictTerminalEvents?: boolean;
   getUsage: () => {
     promptTokens: number;
     completionTokens: number;
@@ -84,6 +85,14 @@ export function createResponsesProxyStreamSession(input: ResponsesProxyStreamSes
 
   const closeOut = () => {
     if (finalized) return;
+    if (input.strictTerminalEvents) {
+      finalized = true;
+      terminalResult = {
+        status: 'failed',
+        errorMessage: 'stream closed before response.completed',
+      };
+      return;
+    }
     finalize();
   };