fix(meta_quest_camera): restore adapter on main + decode preview with Pillow

docs/meta_quest_camera_hardware_qa.md

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+# Meta Quest 3 Camera Adapter — Hardware QA Checklist
+
+Run this against a physical Quest 3 + Macbook before merging any change to
+the `MetaQuestCameraStream` adapter or its Unity counterparts.
+
+## Pre-flight
+
+- [ ] Quest 3 running Horizon OS v74+ with the SyncField companion Unity app built and installed
+- [ ] Camera + microphone permissions granted on Quest
+- [ ] Quest and Macbook on the same WiFi 5/6 network
+- [ ] `uv run pytest tests/` passes on Mac before hardware test
+
+## Feasibility probe (Unity-side, one-time per Unity change)
+
+- [ ] Unity feasibility scene sustains 30 fps on both cameras simultaneously for 3 minutes
+- [ ] Hand tracking packets continue to arrive at 72 Hz during camera capture (check UDPTrackingSender logs)
+- [ ] H.264 hardware encoder reports no dropped frames (MediaCodec logs)
+
+## Adapter integration
+
+- [ ] `MetaQuestCameraStream(...)` connects successfully after discovery finds the Quest
+- [ ] Viewer shows both preview frames within 2 s of `connect()`
+- [ ] Preview stays live through a 3-min idle period
+- [ ] `start_recording()` returns without errors
+- [ ] `SampleEvent`s arrive at ~30 Hz during recording (left-eye driven)
+- [ ] `stop_recording()` completes within 30 s of stop for a 3-min session
+- [ ] Four output files exist with the expected names and non-zero sizes
+- [ ] MP4 files play back in VLC (visual smoke test)
+- [ ] Per-eye `.timestamps.jsonl` lines all have `clock_domain == "remote_quest3"` and monotonic `capture_ns`
+
+## Error paths
+
+- [ ] Turning WiFi off mid-recording surfaces a health event within ~2 s
+- [ ] Quest running out of storage surfaces a warning via `/status`
+- [ ] Killing the Unity app mid-session causes `stop_recording()` to return `status="failed"` with a descriptive error