test: kill surviving mutants — engines, signing, schedule & small stores (batch 1)#42
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…res (batch 1) Adds/strengthens xUnit v3 tests (AwesomeAssertions) to kill every non-equivalent surviving mutant identified by Stryker in the batch-1 files: - RetryEngine: constructor null guard (L26); strengthen L44 with ParamName assertion - MatchingEngine: null guards for eventType (L29) and endpoints (L30) - SigningEngine: null/empty webhookId (L49) and null payload (L50) guards; annotate L74 ZeroMemory as equivalent (defensive key wipe, no observable effect) - RetrySchedule: null guard (L50); message + ParamName assertions for empty (L53) and negative (L60); zero-delay boundary test kills the < vs <= mutant (L58) - WebhookSecret: message + ParamName assertion for invalid-base64 path (L39) - InMemoryEndpointStore: null endpoint guard on UpsertAsync (L13); no-op DisableAsync reference-equality test kills the && Enabled logical mutant (L27) Closes #40 Co-authored-by: William de Witt <williamdewitt@users.noreply.github.com>
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The full-project mutation score is now 96.26% (after #42/#43), so the gate can be ratcheted up from its initial floor. Thresholds become high:90 / low:80 / break:80 — coherent (break == low, the red zone) and meaningful: changed code must clear 80% mutation-kill to merge, while config-touching PRs (which force a full run) pass comfortably against the 96% baseline. Claude-Session: https://claude.ai/code/session_013NxkrufMdQ9cy21T4ZnUNY Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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Automated by the agent-in-the-loop for #40. Closes #40.