feat(notifications): recap markdown/section formatter for the maintainer digest body

[JSONbored]

Render a RecapReport (from the builder bounty) into a formatted digest body, mirroring formatWeeklyValueReportMarkdown at src/services/weekly-value-report.ts:207 — a header plus titled sections. Pure string function, no delivery. Every emitted line MUST pass through the sanitizeReportText redaction pattern at src/services/weekly-value-report.ts:411 so no reward/trust/score/path leaks into a digest.

Deliverables

• formatMaintainerRecap(report): string in src/services/maintainer-recap.ts producing a titled-section body (Summary + section headers)
• Route every line through sanitizeReportText (extract-and-share it from weekly-value-report.ts, or import the shared redaction primitives from src/signals/redaction.ts:39-45)
• Unit test: assert section headers render, empty sections show a fallback line, and a report containing a reward/path term is fully redacted (both regex arms)

References

• src/services/weekly-value-report.ts:207
• src/services/weekly-value-report.ts:411
• src/signals/redaction.ts:39

Part of #1963.

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

[linear-code]

JSO-2341