Move ANSI generation and replay/live ordering to the worker while preserving
existing ANSI clients through the daemon's single-frame restore adapter.
Keep 1,000 rows of retention and hard cut the unreleased cell transport.
Pace replay writes so a healthy large restore cannot fill the shared socket.
If the bounded live tail overflows, end every viewer of that terminal with
an explicit error; a fresh attach restores current state and the PTY survives.
Credit Manav Dhindsa (DrakenKor), #6139, and Lennart Schoch, #6743, for the
prior worker-side ANSI and scrollback work informing this change.
Mohamed Boudra
9ba63a30fa