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l0ng-ai
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Two things a pane lost when the background service stopped and started, both of them things the tree was the only possible place to keep. **The shell.** `PaneRecord` and `PaneSeed` carried a pane's cwd, its ssh spec and its agent, but never what it was running. A window rebuilding a dead pane from the tree therefore had nothing to pass and spawned on whatever the default shell is now — so a restart turned a bash pane into a PowerShell one, quietly and in place. The daemon resolves the override against the config at spawn time and is the only party that knows the answer, so it keeps it and reports it; the seed carries it too, for the panes a window spawned itself. A handoff carries it in the blob, because nothing on the far side of an `execve` can work out the command line of a child it never spawned. **The screen.** The startup sweep ran before the endpoint was listening, which is the one moment nothing can answer the question it asks: the registry is empty and the windows that know which screens are still wanted cannot say so yet. A tree that failed to parse made it worse — `read_machine` quarantines it and returns an empty `Machine`, so one bad file took every pane's stored screen with it. The sweep now happens only on the periodic pass, a tick later, with the registry filled in and the tree caught up; nothing is serving a request in between. Turning the setting *off* still clears the directory at once, because there the promptness is the whole promise. Two smaller ones alongside it: `restorable_pane_ids` now counts the tree's pane list and not only the panes some tab currently stands on — the two disagree while a window is between layouts, and being wrong costs a file swept a tick late in one direction and somebody's terminal in the other. And `restored_screen` drops the snapshot file *after* deciding it was not empty, so a snapshot holding nothing is no longer consumed by the request it could not answer. The restore path had no end-to-end test, which is how this shipped: the unit tests cover the file, not whether a window that reattaches is shown anything. The new one runs a real daemon, puts a marker on a real pane, stops the daemon, starts another, and reads the wire.