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- client: ControlError.sent says whether the display had the request; should_fall_back() allows a mailbox write only when it did not, or when the display is too old to know the command (upgrade case) - on-demand start/stop: a display that had the request and failed it is answered 503 (400 for invalid_args), no mailbox copy - errors.clear: new socket command, answered on the connection thread by a handler the display registers; applied and republished before the answer; plugin_error_clear_request only on fallback - display: on-demand mailbox looked at once a second while the socket is up (0.25 s without), read only when its file changed (one stat via CacheManager.file_signature / MailboxWatch); socket commands no longer touch the mailbox; a processed duplicate is consumed; writers logged once - error publisher: mailbox read only when changed; snapshot carries applied_clear_cutoff so an older mailbox request is not shown pending - docs and CHANGELOG (mailboxes kept for one release) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>