nx2: title 4's cutscene scene renders; blit constants for fragment shaders

- Render area falls back to colour target 0 when the surface clip is unset
  (Switch 2 titles may never program it); it feeds the synthesized blit block.
- BlitConstantsPass also covers fragment shaders: UV clamp rectangle 0..1
  (0x30-0x3c) and zero dither bias.
- Debug: EDEN_NX2_SKIP_VS=<addr,...>, EDEN_NX2_TRACE_VS=<addr>,
  EDEN_NX2_UPSCALE_SOURCE[_FORMAT], EDEN_NX2_TRACE_AFTER_UPSCALE,
  EDEN_NX2_SAMPLE_AT, skipped-draw reasons, clear tracing.

Showing the raw HDR scene colour through the upscale fallback gives the
correct lit cockpit scene; the game's tonemap pass still outputs black.

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