* fix(menubar): always emit avgCostPerSession for older menubar apps
Menubar 0.9.14-0.9.24 decode topProjects[].avgCostPerSession as required,
so omitting it for partial session counts broke Today with any 0.9.25 CLI.
Emit the 0.9.24 value again and keep sessionCountBasis so 0.9.25+ hides
a partial average. Add a test that checks the payload against the
required keys of every released menubar app.
* fix(menubar): restart the app after an in-app update
The app runs `codeburn menubar --force` as its child, and pgrep/pkill
skip their own ancestors, so the running app was never stopped and
`open` re-activated the old copy. Find the app with pgrep -a; when it is
an ancestor, swap the bundle while it runs, exit, and let a detached
helper stop it and open the new bundle. The terminal path stops the app
first as before.
Reported in #1541, thanks @AleksandrLiadov.
