GPU compatibility: test & fix on Adreno (Snapdragon) devices

[molotovgit]

The port is developed on a Mali-G57 (Redmi). Adreno GPUs (most Snapdragon phones) are the biggest untested surface.

What's needed

• Build + run on an Adreno device and report how far it gets (see the device compatibility discussion).
• Triage rendering/shader-compiler/swapchain-format differences vs Mali.

Where to start

• docs/discoveries/dxvk-texture-format-capabilities.md
• docs/discoveries/mobile-gpu-null-guards.md
• docs/fixes/mali-shader-cmpbe-crash.md

Keep Android changes behind #if defined(__ANDROID__). Please don't attach game data — logs and descriptions only.