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`just mobile-dev` fails on Xcode 27 machines that have DeviceHub instead of Simulator. Resolve the simulator frontend inside the selected Xcode installation: DeviceHub for Xcode 27, or Simulator for Xcode 26. Launch by full path so an older installed or running app cannot determine the choice. This extracts the still-needed DeviceHub portion of Wes's [#8330](https://github.com/block/buzz/pull/8330). The CocoaPods deployment-target work already landed in [#8379](https://github.com/block/buzz/pull/8379); this PR does not change Podfile or its lockfile. CI and pre-push mobile selection include the shared Justfile and mobile recipe regression script, so edits to either run the regression in the mobile gate. ### Validation - Nine production-recipe checks pass, covering side-by-side Xcode 26/27 selection with spaces in paths, missing apps, launch failure, and gateway argument forwarding. Mutations reject unqualified Launch Services lookup and removal of DeviceHub selection. - All 39 tests of the pinned paths-filter action pass, including the Justfile and recipe-test selection cases. Mobile formatting, analysis, and the full mobile suite pass. - Native macOS smoke checks exercised launch from the selected Xcode installation and reached the Flutter boundary. Flutter and identity setup were stubbed, so no app was built or installed. - The initial full local CI gate stopped on an unchanged ACP signal-cancellation test; that exact test passed in isolation. The initial pre-push run also hit missing dependencies and two unchanged desktop agent-discovery tests. Desktop lint and TypeScript checks passed after installing pinned dependencies. Publishing used the authorized local-hook exception. - Current-head [CI](https://github.com/block/buzz/actions/runs/38963831198) passed, including all nine recipe cases and native Swift validation. Owner approval and Codex code/security reviews are complete with no unresolved findings. buzz-review-completed --------- Signed-off-by: Tom Brow <tomb@block.xyz>