feat(helper): watchos simulator support#74
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The helper now bundles one interposer per simulator platform (ios and watchos), so the fence --helper gate can no longer assume a single ios slice. It iterates every interposer in the bundle and requires each to carry only simulator platforms, allowing the known simulator platforms and failing closed on any device platform or unreadable build. build-menubar-app.sh copies and signs both slices; the self-test covers the watchos slice, both slices together, and device-platform rejection (synthesized with vtool).
Skip a booted sim whose platform has no slice, not arm it with one its dyld rejects.
The watch target shares the iOS Secure Enclave model; only the UI differs.
Mirrors the iOS proof on the watch slice; needs the watchOS runtime to run.
tvOS and visionOS noted as the same mechanism, not built yet (no overclaim).
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Adds watchOS Simulator support, on top of the watchos slice (#73).
The fence now accepts any simulator slice and fails closed on a device platform, so the helper ships both the iOS and watchOS interposers. The helper arms each booted simulator with the slice that matches its platform, and a platform with no slice is skipped. The native example gains a watchOS target that shares the iOS Secure Enclave model. run-mechanism-d-watchos.sh runs the same in-sim signature proof on a booted watch simulator (it needs the watchOS Simulator runtime).