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7bf00006 - Fix LTX2 connector token/register layout (regression from #13564) (#13931)

Fix LTX2 connector token/register layout (regression from #13564) (#13931) * Fix LTX2 connector register layout to match the original LTX implementation The connector replaced left-padding positions with the tiled registers and then flipped the whole sequence, which put the prompt tokens at the front in reversed order and the register tile reversed within each block. The original LTX implementation (ltx-core _replace_padded_with_learnable_registers, also matched by ComfyUI) front-aligns the valid tokens in their original order and fills the tail with registers indexed by absolute position. Since the connector blocks apply RoPE, the reversed layout produces off-distribution embeddings; short prompts (e.g. negative prompts, whose context is mostly registers) are hit hardest, which manifests as overblown CFG: at cfg > 1 (or CFG++ samplers at cfg 1) the unconditional branch is computed from a mostly-register context with scrambled positions. Replace the fill+flip with a stable-argsort gather (valid tokens to the front, order preserved, per batch row) and fill the tail with the absolute-position register tile. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Add register-layout regression tests for the LTX2 text connectors Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>