fix(producer): pass variables to duration probe

packages/producer/src/services/render/stages/probeStage.test.ts

@@ -6,6 +6,7 @@ import { hasAutoStartVideos, hasScriptedAudioVolumeAutomation } from "./probeSta
 // the correct forceScreenshot value (regression for #1236 — probe was launched
 // in beginframe mode even when lowMemoryMode demanded screenshot capture).
 const capturedCfgs: unknown[] = [];
+const capturedOptions: unknown[] = [];
 
 const mockPage = {
   evaluate: async () => ({
@@ -39,12 +40,13 @@ mock.module("@hyperframes/engine", () => ({
   createCaptureSession: async (
     _url: string,
     _dir: string,
-    _opts: unknown,
+    opts: unknown,
     _nullArg: unknown,
     cfg: unknown,
   ) => {
     createSessionCallCount++;
     capturedCfgs.push(cfg);
+    capturedOptions.push(opts);
     if (createSessionError && createSessionCallCount <= createSessionFailUntilAttempt) {
       throw createSessionError;
     }
@@ -279,6 +281,21 @@ describe("runProbeStage — forceScreenshot threading", () => {
   });
 });
 
+describe("runProbeStage — render variable threading", () => {
+  it("passes render variables to the duration-discovery capture session", async () => {
+    capturedOptions.length = 0;
+    const { runProbeStage } = await import("./probeStage.js");
+    const input = makeProbeInput({ stageForceScreenshot: false });
+    input.job.config.variables = { short: true, sceneCount: 2 };
+
+    await runProbeStage(input);
+
+    expect(capturedOptions[0]).toMatchObject({
+      variables: { short: true, sceneCount: 2 },
+    });
+  });
+});
+
 describe("runProbeStage — transient browser error retry (#1687)", () => {
   it("retries once on a transient 'Navigating frame was detached' error and succeeds", async () => {
     resetRetryMocks();

packages/producer/src/services/render/stages/probeStage.ts

@@ -199,6 +199,7 @@ export async function runProbeStage(input: ProbeStageInput): Promise<ProbeStageR
       fps: job.config.fps,
       format: needsAlpha ? "png" : "jpeg",
       quality: needsAlpha ? undefined : 80,
+      variables: job.config.variables,
       deviceScaleFactor,
     };