umputun / agterm / 35550970648

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explicit zmx lead for remote-attached sessions, with a cover on the pane that follows (#635)

* build(zmx): patch the pinned zmx with explicit session leadership

setup.sh applies scripts/zmx-patches/*.patch over ZMX_REV and folds their digest into the build stamp and the CI cache key, so editing a patch rebuilds zmx like a pin change does.

the patch adds an opt-in for a terminal that manages leadership itself. a client attached with ZMX_MANAGED leads only by claiming at attach, never by typing or resizing, and is told its role through a reserved OSC 777 notification written at a safe point of the output. zmx screen reads the daemon's own terminal and zmx type queues input with an acknowledgement and without taking the lead. clients that do not opt in behave as upstream.

* feat(remote): take the lead at attach and cover a pane that follows another Mac

every zmx attach agterm starts is now a managed client. attaching a session from another Mac claims the lead in every pane at once, so its grid applies without a key press, and typed automation on either side no longer moves the lead back.

a pane whose client does not lead is covered, since what it drew is laid out for the other grid. its first key press takes the lead back through a fresh attach into a new surface, and the same happens by itself when the leader goes away. while a pane is covered session.text and surface.cursor are answered by the daemon's own terminal and session.type goes through zmx type, so pane-to-pane automation keeps working on the Mac a session runs on. a covered pane attached from another Mac refuses those three instead.

the role travels as a title under a reserved prefix. libghostty drops a desktop notification that follows another within a second, app-wide, which lost the report after every re-attach. a static title in the user's ghostty config would drop the reports too, so it is cleared in every config build and its effect, ignoring program titles, is kept by the title ... (continued)

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