ci(backend): run mutation testing monthly in shards - #399
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- add `just mutation`: mutmut over app/ against one shared throwaway Postgres, listing functions whose survivor count exceeds a committed baseline - add `just mutation-baseline` to accept triaged survivors - let the test suite use an already-running Postgres (TEST_POSTGRES_HOST/PORT) and give each forked mutant run its own database - schedule the run in the Ops workflow and upload the survivor lists
- run local mutation testing at low priority on half the cores; the Ops job uses all of them - fail after 60s if the throwaway Postgres never accepts connections - document cached verdicts and full-run-only rebaselining - reuse the Postgres coordinates helper for xdist workers - relock with the pinned uv version
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- split the Ops mutation job into six matrix shards by mutant name, so each stays well inside the job time limit - move it to its own monthly schedule; the other Ops jobs stay weekly - pass mutant globs through to mutmut without shell expansion - document rebaselining from the shards' survivor lists
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Runs mutmut over the backend app monthly in the Ops workflow (or on demand with
operation: mutation), split into six shards by package so each stays inside the job time limit, and uploads each shard's survivor list. It reports functions whose survivor count is above a committed baseline and never fails on survivors. Run it locally withjust mutation, narrowed with mutant globs; it runs at low priority on half the cores.Refs #169.