runGit() previously called Process.waitUntilExit() synchronously on
the MainActor with no timeout. If a git network operation (push/pull/
fetch) was in flight when the Mac went to sleep, the dead connection
could hang indefinitely on wake with no OS-level timeout of its own,
freezing the entire app UI with nothing logged since the command never
actually finished. Now runs on a background queue with a 30s timeout
(120s for clone), matching the pattern already used by bash_execute.
rune
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