feat(mutation): operator parallelism, multi-format reports, and history tracking#75
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…ed by OperatorConcurrency
Add TestWriteReport_AllKeyword to verify the "all" shorthand.
…eport formats early
…ort default case, fix ↓ delta sign
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Summary
engine.gonow runs operators concurrently, each with its own proxy instance. Bounded by--operator-concurrency(default 2); inner--concurrencystill controls per-operator case parallelism.--report-format json,markdown,html,allflag writes multi-format reports.RenderMarkdownproduces a survivor risk table;RenderHTMLproduces a self-contained heatmap (inline CSS, no external deps)."all"expands to all three.--historyprints a trend table of past runs from.caseforge/mutation/runs/including delta (↑/↓/—) and 7-day average score.--targetand--casesare not required when using--history.New flags
--operator-concurrency--report-formatjsonjson,markdown,html,all--history--history-limitTest Plan
go test ./... -count=1— all packages pass./scripts/acceptance.sh— 265/265 pass (AT-404 through AT-409 are new)go vet ./...— clean--report-format jsn(typo) fails immediately with clear error before any mutation run--historyworks without--targetor--casesLoadHistorylimit applied after JSON filter (non-JSON files don't consume limit slots)