add per-pane display ownership

CHANGELOG.md

@@ -25,6 +25,10 @@ loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - TCP attaches now require a lightweight bearer token stored under
   `$XDG_DATA_HOME/patterm/clients/token`; local unix-socket attaches
   remain exempt and rely on socket file permissions.
+- The daemon now tracks a display owner per pane so a second client
+  viewing the same pane does not resize the underlying PTY/emulator;
+  ownership is released on detach and the next focuser can claim and
+  resize the pane.
 - patterm can now keep multiple local projects loaded in one loopback
   daemon core, with command-palette entries to switch the current
   client view or open another project without tearing down processes