Enhance CodexExecutor with compact URL support

open-sse/executors/codex.js

@@ -87,10 +87,17 @@ export class CodexExecutor extends BaseExecutor {
     return headers;
   }
 
+  buildUrl(model, stream, urlIndex = 0, credentials = null) {
+    const base = super.buildUrl(model, stream, urlIndex, credentials);
+    return this._isCompact ? `${base}/compact` : base;
+  }
+
   /**
    * Transform request before sending - inject default instructions if missing
    */
   transformRequest(model, body, stream, credentials) {
+    this._isCompact = !!body._compact;
+    delete body._compact;
     // Resolve conversation-stable session_id from input history + machineId
     this._currentSessionId = resolveConversationSessionId(body.input, cachedMachineId);
     // Convert string input to array format (Codex API requires input as array)

src/app/api/v1/responses/compact/route.js

@@ -0,0 +1,37 @@
+import { handleChat } from "@/sse/handlers/chat.js";
+import { initTranslators } from "open-sse/translator/index.js";
+
+let initialized = false;
+
+async function ensureInitialized() {
+  if (!initialized) {
+    await initTranslators();
+    initialized = true;
+  }
+}
+
+export async function OPTIONS() {
+  return new Response(null, {
+    headers: {
+      "Access-Control-Allow-Origin": "*",
+      "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
+      "Access-Control-Allow-Headers": "*"
+    }
+  });
+}
+
+/**
+ * POST /v1/responses/compact - Compact conversation context
+ * Reuses the same handleChat pipeline, signals compact via body._compact
+ */
+export async function POST(request) {
+  await ensureInitialized();
+  const body = await request.json();
+  body._compact = true;
+  const newRequest = new Request(request.url, {
+    method: "POST",
+    headers: request.headers,
+    body: JSON.stringify(body)
+  });
+  return await handleChat(newRequest);
+}