fix(producer): reject asset media type mismatches (#2937)

* fix(producer): reject asset media type mismatches

* fix(engine): document read-only AVIF probe

* fix(engine): bound read-only AVIF brand probe

* fix(producer): make media preflight lifecycle-safe

* fix(producer): reconcile runtime media before preflight

* fix(engine): avoid writable file-open detection

* fix(producer): close runtime media preflight gaps

packages/engine/src/index.ts

@@ -264,9 +264,11 @@ export {
   extractVideoMetadata,
   extractFinalVideoFrameTimestamp,
   extractAudioMetadata,
+  probeMediaProfile,
   analyzeKeyframeIntervals,
   type VideoMetadata,
   type AudioMetadata,
+  type MediaProbeProfile,
   type KeyframeAnalysis,
 } from "./utils/ffprobe.js";