nx2: stand in for title 4's tensor-core upscaler and its blit constants

- When a compute program is rejected for tensor-core math, blit its input
  image (handle at cbuf0+0x90) to its output (cbuf0+0xa0) with bilinear
  filtering. Title 4 renders at 2560x1440 and upscales to 3840x2160 with a
  DLSS-style network; this keeps the 4K output fed. EDEN_NX2_TENSOR=stub keeps
  the program with HMMA as D = C (for experiments).
- BlitConstantsPass: vertex shaders reading bank 24 (lowered to 17) get the
  console-provided blit block synthesized from the render area (texel size,
  size, UV scale 1, rectangle 0..W-1,H-1).
- Debug: EDEN_NX2_CB24_TRACE, upscaler resource description and render target
  sampling at the fallback.

The scene behind the intro dialogue is still black: the tonemap output that
feeds the upscaler has no colour although earlier targets do.

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