Replaces the source-phase-RoPE-only approximation with a faithful native port of
ComfyUI-BFSNodes' LTX Identity Transfer (read upstream source directly): the reference
face is now injected as separate, non-rendered overlap tokens (clean timestep, RoPE
source-phase tag, trimmed before output) instead of blending into Continuity's identity-pin
keyframe, plus an optional ArcFace embedding -> IdentityProjector -> context-token channel
(identity_projector, source_id, phase_scale, id_strength, arcface_mode, debug_log). Stays
on Chain Sampler per the Studio/Sampler boundary law's guide-ops carve-out. New
identity_transfer.py module; insightface added as a soft pip dependency.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
