[freezy]

Reject URP-only FSR1/STP settings when applying HDRP graphics configuration so they cannot accidentally select another upscaler.

Validation: coordinated Linux standalone build succeeded; 31 Unity EditMode tests passed. Cold and warm T2 loading completed without an Intel GPU timeout; warm cache loading took 2.1 seconds.

Part of the coordinated fix/urp-player-gpu-cache changes across the engine, player, URP/HDRP adapters, PinMAME, and URP player project.

Coordinated PRs:

• VisualPinball.Engine
• VisualPinball.Engine.Player
• VisualPinball.Unity.Urp
• VisualPinball.Unity.Hdrp
• VisualPinball.Engine.PinMAME
• VisualPinball.Engine.Player.Urp

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge.

Summary

Preserves the requested upscaler value instead of clamping it into HDRP's supported range.

• HDRP leaves unsupported upscaler choices turned off.

_{Reviews (1) · Last reviewed commit: "Reject unsupported URP upscalers in HDRP" · Reviewed by Greptile}