The Dock stores persistent-apps as type-15 file:// URLs; the type-0/raw-path
tile we wrote was silently dropped on the next Dock restart (so the pin never
took, yet we'd stamped the marker and never retried). Use pathToFileURL + type
15 and flush prefs through cfprefsd before `killall Dock`. Verified end-to-end
on a packaged build: move -> adopt -> Dock tile lands as
file:///Applications/Hermes.app/.
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