fix(open): launch older Xcodes on newer macOS - #855
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NSWorkspace.openApplication routes through LaunchServices, which refuses to launch an Xcode built before the current macOS (e.g. Xcode 26 on macOS 27), showing an 'update to the latest version' dialog and making the Open button unusable for those versions. Launch the Xcode executable directly to bypass that compatibility gate. Before spawning, reuse an already-running instance of the same Xcode (matched by bundle URL) and activate it, so repeated clicks do not spawn duplicate processes. Rosetta launches are preserved via arch -x86_64.
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I updated to macOS 27 but still need Xcode 26.6 for an old project that doesn't build against the newer SDK. macOS blocks that version of Xcode when opened normally, so I had to launch its executable directly from Terminal:
Xcodes hit the same compatibility check because its Open action used NSWorkspace. This change directly launches an Xcode that predates the running macOS, while compatible versions continue to open normally through NSWorkspace. It also reuses and activates an existing instance, preserves Open in Rosetta, and adds a test for the version check.
This builds on the approach from #686.
Related: #784, #434.