beta.2: Quality 120 out of the box

This release packages .136. It changes what a first-time user sees after beta.1:
a fresh install streams Quality 120 Hz, the recommended profile, instead of Starter 72 Hz, and
the dashboard stays quiet while the stream works.

• Fresh-install settings = Quality 120 Hz: 2272 x 2432 per eye (110 %), the game rendered at
  150 % and downsampled on the PC with Lanczos, CDF 5/3 on the compute decoder, 1500 Mbit/s,
  120 Hz, sharpening 30, maximum GPU clock. beta.1 measured 111-120 fresh FPS of 120 for this
  profile in short screens over USB.
• Starter 72 Hz is now a fallback. It is still in the headset menu and the dashboard list. Use
  it if the stream does not start or stutters.
• On Wi-Fi, pick a Wi-Fi profile. Quality 120's 1500 Mbit/s is meant for USB; choose Wi-Fi
  Quality 120 Hz (Wi-Fi 6E) or Wi-Fi 90 Hz in the headset menu.
• No red errors for a working stream (.136). Tracking and pose measurements, logged every
  5 s for diagnostics, no longer fill the dashboard's notification bar; the Logs tab and
  crash_log.txt keep them. A handshake that times out while the headset app starts is logged as
  information, not an error.

An existing install keeps its saved settings. Pick a profile once to move to the tested values.
Keep beta.1 for rollback; this APK is signed with the same key and installs over it. Not
established, as in beta.1: sustained gameplay, optical motion-to-photon latency, and an advantage
over Virtual Desktop.

Install

1. Stop SteamVR. Extract Quest3-Pyrowave-Windows.zip into a new folder, run ALVR Dashboard.exe
   and register the driver.
2. Install Quest3-Pyrowave-dev.apk and open Quest3 PyroWave from Unknown Sources.
3. Start SteamVR and turn on Devices → Wired Connection (USB), or trust the headset under
   New Wireless Devices (Wi-Fi). SteamVR restarts once on the first connection. A fresh install
   streams Quality 120 Hz.
4. To change profiles, hold both thumbsticks in the headset for about 0.7 s, or use
   Settings → Presets → Streaming profile on the PC. The profile guide explains
   each one.

Verification

• CI's Windows Rust tests and the Python suite pass on the release commit; the local
  fast_build.py test run passes on the same source.
• First-time setup on hardware: a new folder with no saved settings, the APK installed over USB,
  Devices → Wired Connection turned on, the headset app opened by the server. .135 and
  .136 both streamed Quality 120 Hz without any setting changed: 119 fresh FPS of 120,
  1.1 Gbit/s, 0 packets lost, ALVR's latency estimate 35-39 ms, the headset compositor at
  120/120. SteamVR restarted once on the first connection. With .136 the dashboard showed
  Streaming and no error bar. Quest 3 on Horizon OS v2.9, Radeon RX 7900 XTX, short screens in
  SteamVR Home.

Assets

1. Quest3-Pyrowave-dev.apk: the Quest client, signed with the stable release key (same
   certificate as beta.1).
2. Quest3-Pyrowave-Windows.zip: dashboard, SteamVR driver and bundled files.
3. APK-CERTIFICATE.txt: the APK's signing certificate digest.
4. Quest3-Pyrowave-Android-LICENSES.zip: licences of the Android client's dependencies.
5. BUILD-METADATA.json: source commit and toolchain of this build.
6. SHA256SUMS.txt: checksums of the assets above.

Built locally from the tagged commit with tools/local/fast_build.py
(LOCAL-BUILD.md).