Records the outcome of the 2026-05 mutation-testing campaign and the
gotchas for future runs:
- always pass --all-features so the async runners and explorer module
are compiled (otherwise their mutants are unviable/missed noise);
- --test-tool nextest needs --no-config because the libtest-style
--test-threads=1 arg isn't accepted there;
- where the new invariant tests live, and what the residual MISSED /
TIMEOUT categories actually represent.
swaits
54f9db5dc9