2026-10-18 correction to run.log: the first extra-mutants.sh run (inside run.sh, 13:43-13:44Z) had no output
directory, so d1's edit stayed in r143-r2's broker.mjs and d2's edit could not match. Every r2 single and package
run had finished before it (13:42:24-13:43:02Z, manifest-clean tree), Researcher's mutants.sh ran before it, and
the combined runs used the separate r143-149 worktree. Fixed extra-mutants.sh (mkdir -p, refuse a failed backup),
restored broker.mjs from row143.patch (all 11 manifest hashes OK), reran: extra.log (ends 13:45:08Z), tree clean after.
