chore: macOS 26 window-state probe build (do not merge)

[ocavue]

Instrumented build for reproducing the macOS 26 window-collapse bug on a test machine: the "Window probe (macOS arm64)" workflow uploads an unsigned arm64 Reflect Probe.app plus a driver script, and apps/desktop/scripts/window-probe/README.md explains the automated data-collection run.

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