feat(notifications): pure maintainer-recap builder — aggregate review activity into a RecapReport

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Foundation for the #1963 recap digest: a pure builder that folds a window of gittensory's own review-outcome data (PRs reviewed / merged / closed counts + gate false-positive / override counts + reversal count) into a single serializable RecapReport object. No delivery, no scheduling — just the data-shaping seam, exactly mirroring how src/services/weekly-value-report.ts:129 buildWeeklyValueReport takes injected inputs and returns a report. Reuse the existing aggregators (services/gate-precision.ts buildGatePrecisionReport, services/outcome-calibration.ts buildRepoOutcomeCalibration) referenced from src/review/ops-wire.ts:10-14 as the data sources so no new D1 queries are added.

Deliverables

• New src/services/maintainer-recap.ts exporting a RecapReport type and a pure buildMaintainerRecap(inputs) function (inputs-injected, like buildWeeklyValueReport at src/services/weekly-value-report.ts:129)
• RecapReport carries a window (days), per-repo counts (reviewed / merged / closed), and top-line gate/reversal totals — sourced from the GatePrecisionReport / OutcomeCalibration shapes already imported in src/review/ops-wire.ts:30-31
• Add RecapReport to src/types.ts alongside WeeklyValueReport
• Unit test in test/unit/ covering empty-window, single-repo, and multi-repo aggregation with both branches of every ?? / optional field (97% branch-counted)

References

• src/services/weekly-value-report.ts:129
• src/review/ops-wire.ts:10
• src/services/gate-precision.ts
• src/services/outcome-calibration.ts
• src/types.ts:165

Part of #1963.

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size: M · held for later release (gittensor:feature once activated)

[linear-code]

JSO-2340