Add mutation-testing-rollout skill#73
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Distil the estate-wide mutation-testing programme into a reusable skill: per-repository adoption of the shared `mutation-cargo`/ `mutation-mutmut` callers, baseline verification under the mutation runner's conditions (nextest isolation, doctest blind spots, the mutmut sandbox), contract-test conventions (shape-only SHA pinning), survivor triage discipline, run sweeps, and the hard-won estate lessons (unpinned-linter drift, stale checkouts, false survivors from companion crates). `install-skills` picks the new directory up automatically; no registration is required.
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✨ Finishing Touches🧪 Generate unit tests (beta)
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The first estate sweep disproved wall-clock duration as a triage signal (runner-queue wait inflates 15-second no-ops to an hour) and surfaced two silent-suppression traps and the change-detection gate's coverage suppression. Key sweeps on `mutation_detect_has_changes` and the mutants job conclusion instead, verify suppressions by scoped re-run, and dispatch a full run after merging a baseline fix rather than waiting for the schedule.
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Summary
This branch adds a new skill,
skills/mutation-testing-rollout/, capturing theprocess used to roll scheduled, informational mutation testing out across the
github.com/leynos/* estate and to operate it afterwards. It covers the
architecture (thin per-repository callers of the shared
mutation-cargo.yml/mutation-mutmut.ymlreusable workflows, SHA-pinned andDependabot-owned), the per-repository adoption recipe with the baseline
hazards found in practice (nextest isolation, doctest blind spots, the mutmut
sandbox, workflow-source tree pollution, stateful test dependencies), the
contract-test conventions (shape-only SHA assertions), the survivor-triage
discipline (issues per area, killing tests over skips, dead-code deletion,
kill-site traceability), run-sweep operation, and the estate lessons
(unpinned-linter drift, stale local checkouts, companion-crate false
survivors).
install-skillscopies every directory underskills/automatically, so noregistration is needed.
Review walkthrough
skills/mutation-testing-rollout/SKILL.md,
following the repository's existing
description:frontmatter + directiveprose convention (compare
skills/rebase/SKILL.md).
Validation
markdownlint(repository script) on the new file: 0 errorstypos --config typos.tomlon the new file: clean (en-GB Oxford-ize)Notes
The content distils the rollout tracked in the estate's mutation-testing
rollout plan; it is written to be applied to any comparable estate, not only
the current one.