Wire prior archive cutoff through API

Co-authored-by: Cursor <cursoragent@cursor.com>

.superpowers/sdd/task-3-report.md

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+# Task 3 Report: Wire API call-sites + auth cutoff + stop auto-stamp
+
+## Status
+
+DONE_WITH_CONCERNS
+
+## Summary
+
+- Updated all API call sites in scope to use `dealPriorWhere(lens, cutoff)` and `activityPriorWhere(lens, cutoff)`.
+- Removed person/company prior-lens filtering from contacts, reports, and AI count paths.
+- Exposed `priorArchive.cutoffAt` from auth DTO generation and kept JWT `priorCutoff` null unless both grant and organization cutoff exist.
+- Added `promotedFromPriorAt` mapping to Deal and Activity DTOs.
+- Stopped billing module enable from auto-writing `priorArchiveEnabledAt`; existing cutoff values are preserved.
+
+## Files Changed
+
+- `apps/api/src/auth/jwt.strategy.ts`
+- `apps/api/src/auth/auth.service.ts`
+- `apps/api/src/billing/billing.service.ts`
+- `apps/api/src/pipelines/pipelines.service.ts`
+- `apps/api/src/pipelines/deals-excel.service.ts`
+- `apps/api/src/activities/activities.service.ts`
+- `apps/api/src/reports/reports.service.ts`
+- `apps/api/src/ai/ai-ask.service.ts`
+- `apps/api/src/contacts/people.service.ts`
+- `apps/api/src/contacts/companies.service.ts`
+
+## Verification
+
+- `npx prisma generate` from `apps/api`: passed.
+- `npm run typecheck -w @mento/api`: passed.
+- IDE lint diagnostics for edited files: no errors found.
+- `graphify update .`: attempted after edits, crashed with exit code `3221225477` and no output; treated as non-blocking per task instructions.
+
+## Concerns
+
+- No focused tests were added; verification is the requested API typecheck plus lint diagnostics.
+- `billing.service.ts` still runs the existing prior-activity backfill only when an organization already has a cutoff. It no longer creates a cutoff when enabling the module.