v1.20.4

• Fix secondary windows coming back empty or with stale scrollback after an update or restart. Two fixes: a window whose active workspace had been suspended now un-suspends and respawns its tabs on load instead of returning blank, and an update relaunch now flushes every window's terminal scrollback before restarting — previously only the window you triggered the update from was saved, so other windows lost their buffers.
• Older "limbo" terminal tabs — ones whose PTY had ended without going through a normal suspend — are now normalized to suspended, so they show a proper "suspended Xd ago" age and are counted correctly in diagnostics instead of as uninitialized.