Every result written by fleetcheck's validation scripts carries a stamp.
Commits are read from the RemoteSha or GithubSHA1 field that remotes,
pak and devtools write when installing from GitHub; a package installed
from a local source tree has neither, so its commit is NA and fleet's
Built field shows when and on what it was built.
Value
A named list, suitable for writing as JSON beside the result:
taken (the time), fleet, fleet_sha, fleet_built,
malariasimulation, malariasimulation_sha, postie (versions and
seven-character commits), R, platform, fleetcheck_sha (the
checkout's commit), then the fields in .... Anything unavailable is NA.