feat(export): integrate 'Queue in encoderCraft' for 2D animation timelines, sprite sheets, and video renders #6

Summary

Integrate AniCraft with encoderCraft (el-j/encoderCraft#1) via the shared ArtCraft inter-app dispatch protocol (craft-dispatch, storytold/craft-libs#505).

Scope

• Add File > Export > Queue in encoderCraft... to dispatch 2D animation timelines and scenes to encoderCraft via IPC (/tmp/encodercraft-$UID.sock or loopback 127.0.0.1:8998).
• Offload multi-target video rendering (H.264/HEVC/AV1 MP4, Apple ProRes 4444 MOV with alpha, Broadcast MXF OP1a, WebM, animated GIF, PNG/WebP still sequences, and synchronized AAC/WAV/FLAC audio tracks) to encoderCraft in the background.

Tracking & Cross-Links

• encoderCraft Master Tracking Issue: el-j/encoderCraft#1
• encoderCraft Repository: el-j/encoderCraft
• Shared Dispatch Protocol: storytold/craft-libs#505
• Shared Media Codecs: storytold/craft-libs#503 / storytold/craft-libs#504