Switch 2: back GPU-only regions, pace presents, interleaved split methods

- gpu 214 creates GPU-only memory the graphics server backs itself (title 4
  renders everything into six 300 MB regions at 0x81_0000_0000). Back each
  with application-pool pages mapped into the alias code region and map that
  for the GPU. This is what made title 4's frames appear.
- vi2 229 waits (bounded) for the presented frame's GPU fence: the reply
  reports every buffer free, so without this the game laps Eden's GPU thread
  and rewrites command memory it has not read yet.
- Split methods: keep several parked methods keyed by resume address (NVN
  interleaves command buffers) and drop them when the submission ends.
- hid 214 (per-frame vibration send) answered quietly.
- Debug aids: EDEN_NX2_WINDOW_TRACE / EDEN_NX2_RT_TRACE (render targets,
  clears, textures), EDEN_NX2_AUDIO_LEVEL (output peak), EDEN_NX2_PB_DUMP
  (command list for offline replay), parsed-entry change check.

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