The short package name whose backronym heads the line
(e.g. 'chell', 'calypso'). Unknown names fall back to the surface.
The package version to display.
The short build hash to display.
A line of the form ChELL Executes Layered Logic, v 5.3.0 (886f09). Welcome.
for a surface; a session host's line ends at the build, with no welcome.
Composes the startup welcome line from explicit version and build values.
Separated from welcomeLine_build so a remote surface can render the line from the versions the daemon reported in its attach handshake, rather than from whatever happens to be installed client-side.