Fix simulator build on Xcode 26 / macOS 26 #154
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Fix #148
Xcode 26's macOS 26 SDK automatically imports _DarwinFoundation modules, which are incompatible with Embedded Swift mode. This causes build failures with errors like:
error: module '_DarwinFoundation1' cannot be imported in embedded Swift mode
This fix explicitly sets the target to arm64-apple-macos14 in the simulator toolset, which avoids the macOS 26 SDK's implicit Foundation imports while still producing a working simulator binary.
Changes: