fix: drop the H3 v2a_grad_scale chip

v2a_grad_scale does nothing without joyai_audio_memory on any model, and
gating the chip on that toggle still left a warning about a knob the user
never asked about. Removes the chip, its fingerprint inputs, and the docs
line.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/MovieEditor.md

@@ -682,9 +682,8 @@ using both at once in one scene means one of them is untrained conditioning. Tex
 and both VAEs are shared. Needs ComfyUI v0.30.0 or newer.
 
 **Inert on H3:** Best-FaceID identity transfer, Bounded Attention, segmented detailing, the
-second pass's latent op, and `v2a_grad_scale` all depend on LTX transformer structure H3
-does not have. The Chain Sampler switches them off and says why; the main window warns
-before the run.
+and the second pass's latent op all depend on LTX transformer structure H3 does not have.
+The Chain Sampler switches them off and says why; the main window warns before the run.
 
 **Wrong:** Install stuck → **Cancel install**. Pip security policy errors → install packs manually in terminal. After Manager install, restart before pack install.
 

movie_editor/frontend/pipeline_caps.js

@@ -106,14 +106,6 @@
   // Same idea for non-boolean knobs whose neutral value means "off".
   function h3DeadValueIssues(si) {
     const out = [];
-    // Only when joyai_audio_memory is on: v2a_grad_scale is that feature's coupling knob and
-    // does nothing without it on ANY model, so flagging a left-over value as an H3 limitation
-    // blames the wrong thing — it would be equally inert on LTX.
-    if (si.joyai_audio_memory && Math.abs(Number(si.v2a_grad_scale ?? 1) - 1) > 1e-6) {
-      out.push(["v2a_grad_scale",
-        "v2a_grad_scale scales LTXAV's video→audio cross-attention module; H3 has no separate "
-        + "video→audio attention, only joint rows."]);
-    }
     if (si.second_pass && si.second_pass_op && si.second_pass_op !== "none") {
       out.push(["second_pass_op",
         "The second pass still runs on H3, but its latent op ('" + si.second_pass_op + "') uses the "

movie_editor/frontend/view_bus.js

@@ -137,10 +137,6 @@
       core: (st.models || st.project?.models)?.disable_core,
       h3Bounded: st.project?.sampler_inputs?.bounded_attention_enabled,
       h3Detail: st.project?.sampler_inputs?.segmented_detailing,
-      // v2a_grad_scale only warns while joyai_audio_memory is on, so the toggle is part
-      // of the chip's message — without it, switching JoyAI off leaves the chip stranded.
-      h3Joyai: st.project?.sampler_inputs?.joyai_audio_memory,
-      h3V2a: st.project?.sampler_inputs?.v2a_grad_scale,
       h3Pass2: st.project?.sampler_inputs?.second_pass,
       h3Pass2Op: st.project?.sampler_inputs?.second_pass_op,
       // ... including the project's frame rate, which the H3 fixed-24-fps chip reads.