* Refuse a chat create whose close came first, behind the layout-owner switch
With ORCA_LAYOUT_OWNER=main, main remembers a close that reaches it before
the chat's create and refuses that create, or closes the chat as it lands.
The window then tells this machine's host about a cancel instead of
keeping a cancel tombstone; a host it cannot tell still gets the
tombstone. Paired hosts keep the tombstones, whose fence module moves to
lib/launch-cancel-tombstones-compat/.
* Close a chat whose create a cancel beat, on any create outcome
The local cancel now retires the chat on main (close and host-tab close),
so a create that landed first leaves no tab behind; a tab_not_found answer
means the create had not landed. Main closes the chat for any create
answer once a close was noted, including a refusal or a throw past commit,
and publishes no tab for it. The tombstone fallback notifies listeners.
* Keep the switched-off create path byte-identical
* Log, not throw, a failed close of a chat closed before create
* Run the close-before-create test in the Node SQLite project
Jinwoo Hong
18df97a7bc