Code review r1 (M1): validate-gate.mjs and merge-candidate's waitValidate
read a `cancelled` dispatch run on the material as red, so a dispatch
replaced by the next one in the `validate-dispatch-<ref>` concurrency
group would have returned the task S7→S6 for nothing — the same class
#511 fixed in release-gate.mjs. Cancelled runs are now ignored: the gate
follows the replacement dispatch, or starts its own when there is none.
Mutant: review-returns-task-on-cancelled-dispatch.
Issue: #510
User-Visible: no
Validate ran the three "Мутанты по диффу" shards on every push of every
branch: 48 of 56 job-hours on 08–09.09, most of them cancelled by the
next push. Mutants now run when asked — pull requests, the nightly
schedule, a push carrying a `Release:` trailer, or a dispatch with
`mutants=true` (classify-changes.mjs → `mutants_requested`); an ordinary
push runs the light checks only.
The proof moves to where it is consumed. process.yml gets a gate after
the #499 reuse step: on the code stage it looks for a dispatch Validate
run on the exact material SHA whose mutant jobs executed and passed
(scripts/validate-gate.mjs); none → it dispatches one and waits; red or
missing → the task goes back S7→S6 with the run link and the review
cycle is not spent. Spec stage and the reuse fast-path skip the gate
(`proceed=true`); all later steps branch on `proceed` in place of the
old conflict conjunct only. merge-candidate.mjs dispatches Validate on
the pushed candidate and waits for that dispatch run.
PROCESS.md/AGENTS.md: review does not start on red code; one handoff —
one push.
Mutants: mutants-run-on-every-push, review-starts-on-red-validate,
review-trusts-push-run-without-mutants, merge-waits-push-run-without-mutants.
Issue: #510
User-Visible: no
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