The extensions `events` feature changed the "nothing provided" validation
error from "Extension must provide at least one command or hook" to
"Extension must provide at least one command, hook, or event", but
test_empty_provides_and_no_hooks_keeps_its_own_message still asserted the
old wording, so it failed on main. Update the regex and also pop `events`
from the fixture so the test truly exercises the empty-provides path.
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