feat: session envelope target
 `wayland-session-envelope@.target` is now used to start and stop graphical
 session from the signal handler.

 Waiting on it provides synchronized release after graphical session environment
 is properly brought down (`wayland-wm-env@.service` is deactivated).

 Since login session is now bound to the whole graphical session envelope, this
 prevents failures on restarting a getty with autologin: the old login session
 will not end prematurely, uwsm in new login session will not stumble on still
 deactivating remains of graphical-session-pre.target.

fix!: bake in transient session vars behavior and drop test switch var

fix!: drop non-static units
 "static-units" option was broken, stuck to truthy value, and nobody complained.
 No reason to keep it and a bunch of duplicated data in the main body.

fix: match session to VTNr actually by VTNr
 So kmscon pts device does not throw off the algorithm

fix: autolaunch bindpid service on login session leader if none running

fix: do not auto-add executable name to XDG_CURRENT_DESKTOP if entry's DesktopNames has content, fixes #186
fix: improve desktop names parsing/propagation (fixes #186), session vars fallback saving
fix!: demote compositor executable to the last resort fallback for desktop names
 This would be the most predictable behavior, plugins excluded.
 DM, DesktopNames, and CLI args being the obvious sources.
 Addendum for #186.

fix: always log to journal in signal handler

fix: probe for $DBUS_SESSION_BUS_ADDRESS before trying to talk to DBus in checks

fix: add plugin link for start-hyprland
fix: properly name plugin and function by bin_id rules
build: add actual plugin symlink to track, cleanup unneeded debian/watch params
build: bump meson version due to follow_symlinks param

build: cherry pick some changes from official debian packaging

fix(uuctl): properly fallback cleanup function to true

fix: address some pylint issues

refactor: move shell code from main body to libexec dir

chore: start aggregating relesae summaries.

chore: start using whimsical release names because it is a cool Culture.