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* fix(tree-sync): pay back a remote window's owed tree pull A window opening onto a remote workspace is empty until `hydrate` pulls the machine's tree and rebuilds its tabs from it, and it has to be: an empty window diffs into "close every tab", so `sync_window` holds anything back until the pull lands. When the pull fails, `owe_rehydration` records the debt and returns, on the promise in its own doc comment that the next sync settles it — "which is what a reconnect does through `on_link_up`". `on_link_up` is called for `HostId::LOCAL` and nowhere else. On a remote host the debt was only ever settled by a reconnect completing, by an edit in the window, or by restarting the app. So a pull that failed while the link stayed up was never noticed again: no reconnect, and an empty window has nothing in it to edit. The window sat on the home page with every tab and every shell still on the machine, and only a restart brought them back. Two ways to fail a pull with a healthy link, both routine. A `MachineGet` can overrun its ten seconds on a slow link. And a `WorkspaceCreate` can lose its race with `start_prime`, which runs the same create from the other side of the same window opening — that one fires on every remote workspace opened, and is only invisible because the workspace it usually lands on is empty anyway. So: arm a backed-off retry when the debt is taken on, drive it through `sync_window` where the rules about whether a window may still adopt the machine's layout already live, and stop treating a lost create as a failure — read the tree again and hydrate from what is really there. `on_link_up` is also wired to a remote link coming up, which is what the comment always claimed: a link the switcher connects finishes no attempt, so nothing told its windows the machine could be reached. * fix(tree-sync): end the backoff with the run of failures, and stop shouting Review follow-ups on the owed-pull retry. The attempt count paces the retry, so it has to mean "failures in a row", but it was only cleared when a hydration landed. A debt abandoned rather than paid — a `Replace` dropped because the user filled the window in themselves — and a prime that landed both left it standing, so the next first failure waited the 30s cap on an outage that was already over. It is now cleared wherever the run ends. A window left open on a machine that is really gone retries forever by design, which meant a warn and an info every ~45s for as long as it stayed open. Once the backoff settles at its cap those lines stop being events and become a fact about the machine, so they step down to debug. The retry is exactly as persistent; only the volume drops. Also: report the create's own refusal when the reread finds the workspace still missing, and say at debug that the reread happened at all — the race recovery was silent, so the extra round trip was invisible when reading a log. And correct the comment on the window-gone guard: closing a window drops its whole `WsState` through `forget`, debt and all, so nothing is parked for the next opener. Tests: the count ends with the run at all three sites, the level steps down at the settle point, and the armed retry is driven through a real timer (advance_clock) into the window-gone guard — the first coverage of the retry actually firing rather than of the predicate it consults. --------- Co-authored-by: l0ng-ai <24760907+l0ng-ai@users.noreply.github.com>