Both conflicts were import/export unions in the engine package, resolved by
keeping both sides:
- packages/engine/src/index.ts — main widened the urlDownloader re-export
(fetchPublicHttpsText, safeDownloadUrlIdentity, writeUrlDownloadTelemetry and
their types) while this branch added the notMediaPayload exports.
- packages/engine/src/services/audioMixer.ts — main added UrlDownloadError and
writeUrlDownloadTelemetry to the urlDownloader import; this branch added
isNotMediaPayload.
In audioMixer's prepare path both intents compose in order: main's download
telemetry and typed download failure, then the STUDIO-5433 non-media sniff
before the probe.
Vance Ingalls
c03cc2c52c