Switch 2: title 4 menu text renders upright

- Present flips the image vertically: title 4 renders with a lower-left origin
  (negative viewport scale), so its frames are stored bottom-up.
- Lowering: TEX/TEXS FP16 results (bit 79, packed half pairs) - the glyph
  shaders unpack them with HADD2.F32; LDG.E with a register address;
  SHF.R.U32 low word with a zero high word.
- Debug aids: EDEN_NX2_TRACE_PS / EDEN_NX2_WINDOW_TRACE_SKIP for the window
  trace, EDEN_NX2_TEXTURE_DUMP, EDEN_NX2_TRACE_DST for copies; RT trace keyed
  by shader pair. NX2_NOTES: blockers 53-57, next steps.

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