feat(notifications): schedule the recap job on the cron with a configurable cadence knob

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The scheduling knob for #1963 ('config-driven cadence'): enqueue a maintainer-recap job from the scheduled() cron, gated on isRecapEnabled, following the exact enqueue idiom used for generate-weekly-value-report at src/index.ts:169 and ops-alerts at src/index.ts:161. Cadence (daily vs weekly, hour-of-day / day-of-week) read from an env knob with a safe default so the tick fires at most once per period.

Deliverables

• Add the recap enqueue block in src/index.ts scheduled() gated on isRecapEnabled, using the existing isHourly / hour / getUTCDay guards (src/index.ts:169)
• Parse a cadence env knob (e.g. GITTENSORY_RECAP_CADENCE=daily|weekly) with a documented default; clamp/validate like normalizeReportDays at src/services/weekly-value-report.ts:403
• Unit test the cadence-selection helper: daily fires at the configured hour, weekly only on the configured day+hour, invalid value falls to default (all branches)

References

• src/index.ts:161
• src/index.ts:169
• src/services/weekly-value-report.ts:403

Part of #1963.

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

[linear-code]

JSO-2349