GeezerVison

why: Workspaces could not label panes, run a post-build command wave,
clear panes, or set a final pane-synchronization state without spelling
out raw tmux options. Layer these keys onto the classic builder so the
behavior stays additive and no new builder or entry point is needed.

what:
- Expand session enable_pane_titles/pane_title_position/pane_title_format
  into per-window pane-border options; expand window synchronize into a
  tri-state final sync flag and shell_command_after via expand_cmd
- Force synchronize-panes off (window- and pane-local) while panes and
  post-build commands run, then restore the configured final state
- Send shell_command_after, then clear, then options_after with sync off
  so synchronize:after never duplicates commands across panes
- Apply pane title via pane.set_title after pane commands; warn on empty

why: Cover the new pane title, synchronize, shell_command_after, and
clear keys through both config expansion and a live build, including
synchronize isolation, setup-abort restoration, and plugin precedence.

what:
- Add expand() tests for synchronize, shell_command_after, pane titles
- Add build tests for sync isolation/restore, pane titles, clear, and
  per-command options in shell_command_after fan-out
- Match marker output with a prompt-tolerant helper so /bin/sh panes
  (no readiness wait) do not flake when the prompt shares the row

why: Document the new pane title, synchronize, shell_command_after, and
clear keys with copyable examples so users can adopt them.

what:
- Document pane titles, synchronize, shell_command_after, clear in the
  top-level config reference with focused YAML snippets
- Add pane-titles and synchronize-shorthand examples and reference them
  from the examples gallery
- Note the runtime keys under CHANGES 1.74.0 What's new

why: the synchronize-restore-on-abort test triggered the abort with an
invalid tmux layout. tmux's invalid-layout wording varies by version
and crashes the server outright on tmux 3.3a, so the test failed across
the CI matrix though it passed on a single local tmux version.

what:
- Inject the abort in Python by monkeypatching iter_create_panes to
  raise, after synchronize-panes is disabled and before it is restored
- Drop the version-fragile invalid-layout trigger and its message match