fix(producer): normalize error messages to prevent [object Object] in telemetry (#1099)

* fix(producer): normalize error messages to prevent [object Object] in telemetry

When a render fails and the caught value is a plain object (not an Error
instance), String(error) produces [object Object], masking the real error
in PostHog telemetry (~24 errors/day).

Add normalizeErrorMessage() that tries Error.message, string passthrough,
.message on plain objects, JSON.stringify, and String() as a last resort.
Apply it on the two telemetry-feeding paths: the main render failure
handler (renderOrchestrator.ts:2099) and buildRenderErrorDetails
(cleanup.ts), plus the error classifier isRecoverableParallelCaptureError
so timeout detection works even when the thrown value is a plain object.

* fix: address review — normalize CLI telemetry path, captureCost fallback

* fix: use local normalizeErrorMessage in CLI to avoid cross-package resolution

The Vite test runner can't resolve runtime imports from @hyperframes/producer
since its exports point to dist/. Copy the utility into the CLI package and
import locally instead.

packages/cli/src/commands/render.ts

@@ -49,6 +49,7 @@ import { bytesToMb } from "../telemetry/system.js";
 import { VERSION } from "../version.js";
 import { isDevMode } from "../utils/env.js";
 import { buildDockerRunArgs } from "../utils/dockerRunArgs.js";
+import { normalizeErrorMessage } from "../utils/errorMessage.js";
 import type { RenderJob } from "@hyperframes/producer";
 import {
   normalizeResolutionFlag,
@@ -863,7 +864,7 @@ function handleRenderError(
   docker: boolean,
   hint: string,
 ): never {
-  const message = error instanceof Error ? error.message : String(error);
+  const message = normalizeErrorMessage(error);
   trackRenderError({
     fps: fpsToNumber(options.fps),
     quality: options.quality,