Adopt centralized craft-libs media codecs (craft-hevcenc, craft-av1enc, craft-vp9enc) #2813

Summary

Media encoders originally authored in EffectCraft (effectcraft-hevcenc, effectcraft-av1enc, effectcraft-vp9enc) have been centralized into craft-libs (storytold/craft-libs#504) under the canonical craft-* namespace:

• craft-hevcenc (H.265 / HEVC Main & Main 10)
• craft-av1enc (AV1 Main Profile)
• craft-vp9enc (VP9 Profile 0/2)
• Re-exported via craft-codecs umbrella crate

Motivation

Centralizing all video codecs into craft-libs provides a single, audited source of truth across all ArtCraft applications (effectcraft, filmcraft, and encodercraft), eliminating redundant implementations and allowing shared SIMD acceleration, zero-panic hardening, and memory profiling.

Next Steps

1. Add migration guide documenting the upstream locations in craft-libs.
2. Transition internal effectcraft export pipelines to consume craft-hevcenc, craft-av1enc, and craft-vp9enc from craft-libs.
3. Deprecate local crates in favor of upstream craft-libs dependencies.