Configure Stryker.NET for the ACL in solution mode (Acl.slnx), so both Acl.Application and Acl.Infrastructure — the two projects under test — are mutated while Acl.Api (untested) is skipped. Record the repo-wide mutation baseline as the ratchet (CLAUDE.md §5): observed score 95%, enforced break threshold 90% (one-mutant headroom over the ~20-mutant surface). The ACL is the first service with branching logic, so it sets the baseline; later slices ratchet it up deliberately, never down. Add a `mutation` make target (`dotnet tool restore` + `dotnet stryker`) and wire it into the `make ci` aggregate, keeping `make ci` an exact mirror of the pipeline. Refs #47. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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