MediaRuntime Node SDK 1.4.0

Adds typed clipping options, candidate-plan retrieval, source-timed caption reuse, and optional empty-result diagnostics. Older reports without an empty reason remain supported.

npm install @mediaruntime/node@1.4.0

Validation: 89 tests, TypeScript and consumer checks; local end-to-end jobs exercised the actual gateway and native worker, with caption timing and ZIP integrity verified.

Clipping requires a gateway/engine deployment exposing clip_candidates_v1 and video_clip_v1. Publishing these client packages does not deploy those server features. Manual rendering requires no Whisper model; analysis uses existing Whisper only when no transcript is supplied.

Maintainers: the new manual release guide covers all SDK and CLI releases.