fix(bento): barns vignette — real black outline + coherent blue beta, single theme-independent asset · 2b73a8b5ef - such.software

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fix(bento): barns vignette — real black outline + coherent blue beta, single theme-independent asset

Root causes (all 3D->web pipeline law violations):
- Beta 'flashing / getting deleted': the MatterWave beta was BLEND_ADD (writes ~no
  alpha) so it was stripped by the transparent capture, AND its off-screen auto-free
  killed the packet a third of the way through its flight. Now alpha-safe (MIX under
  BN_ALPHA), pinned alive for the full flight (no_free), bigger + slower + brightness-
  capped so it reads as a coherent BLUE de Broglie packet the whole way in.
- 'No black outline': the 3D inverted-hull shell was sub-pixel + washed by the fresnel
  rim (invisible on light, flecky on dark). Replaced with a 2D silhouette INK STROKE
  from the alpha matte (sg_outline, outline2d.py) — uniform, gap-free, and INSET so the
  black line sits ON the yellow fill and reads on BOTH themes from ONE asset.
- Softened the ripple pulse so the crest stays a blue tint, not a white clip.

Seam diff frame0==frameN = 0.0 (perfectly seamless).

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