tweak output formatting for consistency
consistently use double quotes
restore long-missing bit of dedupe
lifecycle: clean up callback mutation code
slide@1.1.6
wip: Wait until end-of-process to handle rollbacks from install

This ought to nail the ENOENT issues we're seeing in #6043,
albeit in a somewhat kludgey way.

Needs tests, ideally, but this is a tricky one to test for.
eliminate unused dependencies
invoke unbuild correctly
minor style tweaks