Replay each VR eye in one render pass

- Added eye_pass_plan.hpp: an eye keeps drawing in the render pass it has open across the frame's
  GX copies (only the mono render performs them), skips passes a later clear of the whole color and
  depth erases, and splits only for a clear of color alone or depth alone.
- render_stereo_eye follows that plan; the cockpit fallback is drawn inside the last pass instead of
  a render pass of its own that loaded the eye back.
- The stencil is now cleared where the eye actually starts, so a cockpit mask drawn in an erased pass
  can no longer punch holes in the HUD.
- [vr] single_pass_eyes (default on, live from F10) and debug.wiicompiled.eye_passes 0/1 on the Quest
  switch back to one render pass per recorded pass for A/B timing.
- Each new plan shape is logged once ("Eye replay plan: ...").
- Tests: EyePassPlan cases in gx_fifo_tests; stereo_multiplayer_smoke and stereo_frame_worker_smoke
  pass on D3D12.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/quest-port.md

@@ -809,6 +809,7 @@ the app:
 | `debug.wiicompiled.vtxpad 0` | Turns the stride padding off, to re-check a driver update |
 | `debug.wiicompiled.validation 1` | Keeps WebGPU validation and robustness on in release builds |
 | `debug.wiicompiled.panel_layer 0` | Draws the headset settings panel into the eye images instead of on its own quad layer (`OPENXR.md`, Settings in the headset); read about once a second, so it can be switched while the panel is open |
+| `debug.wiicompiled.eye_passes 0` | Replays each eye in one render pass per recorded pass, as before `single_pass_eyes` (`OPENXR.md`); `1` forces the single pass and an empty value restores the setting. Read about once a second, for A/B timing inside one session |
 | `debug.wiicompiled.inject <n>:<button>` | Presses `a`, `b`, `x`, `y`, `start`, `up`, `down`, `left` or `right` for 12 XR frames each time `<n>` changes. As a Wii Remote, `x`/`y`/`start` are 1/2/+, the directions push the Nunchuk stick, and `home`, `c` and `z` also exist. `panel` presses the settings panel's button (left Y, or both thumbsticks as a gamepad), opening or closing it (see `OPENXR.md`) |
 | `debug.wiicompiled.fpslog 1` | Logs the game's rendered frame rate every 5 s, with per-frame averages of the producer's waits for the frame worker's DONE and SEALED phases and of the worker's seal, permit wait, prepare and encode stretches, and of the draw calls the recorded frame holds and the primitives that merged into them (an overlay that stops draws merging shows up there first). A third line reports the GX thread's command ring (records, waits, busy share). A second line gives the GPU time per frame from timestamp queries on every pass (`mono` native render, `eyeL`/`eyeR` replays, `screen`, `panel`, `efbcopy`, `palette`, `peek`, plus `passes-span` from the first pass begin to the last pass end and `between-passes` for copies and idle gaps). The compositor's `VrApi` log line gives headset FPS, `GPU%`, `CPU%`, clock levels and app GPU time (`App=`) |