Add simulator-first tvOS runtime path

[joeblack2k]

Summary

• parameterize the existing tvOS core/module provisioning for device or simulator SDKs
• let Xcode select the provisioned library and module by platform
• bypass only the physical-controller startup gate in the simulator while keeping device behavior fail-closed

Verification

• ./scripts/check-repository.sh
• full libmoderngekko.a build completed for TVOSSIMULATOR, including CoreAudio, Metal, DPL2, and GCPad sources
• GMSE01 tvOS Simulator module build started from the validated generated source and is being used for the simulator launch gate

[joeblack2k]

Simulator gate completed on tvOS 26.5 / Apple TV 4K 1080p: Release app built, installed, loaded the arm64 TVOSSIMULATOR GMSE01 module, created the runtime, and rendered the Delfino airplane intro. Runtime diagnostics confirmed widescreen-16:9, gmse01WidescreenCode=1, genericWidescreenHack=0, and six-channel DPL2 output. Also bundled xxhash for cross-builds after the gate caught CMake selecting the host Homebrew library.

[chrissotraidis]

Thank you, Jeroen — the platform-parameterized tvOS build/provisioning path, Simulator wrapper, and bundled xxhash fix are now incorporated in merged PR #42 and the published Preview 12 release. Both GitHub clean patch-reproducibility jobs rebuilt and compiled the patched Simulator runtime successfully. Your accepted commits are attributed to your GitHub account. I’m closing this source PR because the reviewed integration is now on main.