feat(audit-cleanup): finish all 15 outstanding items from verified backlog

Audit cleanup completion plan, all tiers shipped:

Tier 1 (security + data integrity)
- A.7 RTBF true wipe: redact email_messages body/subject/addresses for
  threads owned by deleted client; redact document_sends.recipient_email;
  collect file storage keys + delete blobs post-commit.
- A.8 user_permission_overrides FK: documented inline why cascade is
  correct (not set-null as audit suggested) — overrides have no value
  without their user.
- W2.14 PII redaction: camelCase normalization in audit.ts +
  error-events.service.ts isSensitiveKey; added city/postal/country/
  birth fragments. firstName/lastName/dateOfBirth/postalCode etc. now
  caught in BOTH masker paths. 12 new test cases lock the coverage.

Tier 2 (Documenso completion + refactor)
- C.2: documentEvents.recipient_email column + partial unique index for
  per-recipient webhook dedup (migration 0075). handleDocumentSigned
  now sets recipient_email on insert.
- Phase 2: completion_cc_emails distribution. handleDocumentCompleted
  reads documents.completionCcEmails, filters out signer-duplicates
  case-insensitively, fans signed PDF out to non-signer recipients.
- C.4: extracted createPublicInterest() service from the 346-line
  api/public/interests route. Route becomes a thin shell (rate-limit,
  port resolution, audit log, email fan-out). The trio creation logic
  is now unit-testable without an HTTP fixture.
- Phase 4: POST /api/v1/document-templates/[id]/detect-fields wired
  to document-field-detector.detectFields(). Sparkles "Auto-detect"
  button added to template-editor.tsx — maps DetectedField → marker
  with best-guess merge token (DATE / NAME / EMAIL); user retags.

Tier 3 (reporting + recommender snapshot lockfiles)
- W7.reports: extracted rollupStageRevenue / rollupStageCounts /
  computeTotalForecast / computeOccupancyRate / rollupBerthStatusCounts
  into src/lib/services/report-math.ts (pure functions). 16 new tests
  including an inline-snapshot lockfile on a representative 7-stage
  forecast. report-generators.ts now delegates.
- W7.recommender: 18 new toMatchSnapshot tripwires on classifyTier
  boundaries + computeHeat at canonical input points.

Tier 4 (rolling)
- W6.attach: fixed outdated CLAUDE.md claim — threshold banner is
  informational and never depended on IMAP; bounce monitoring (the
  IMAP poller) is separate.
- D.1 + D.2: documented deferral inline with full why-not-build-it
  reasoning so a future engineer sees the rationale.
- G.1: representative formatDate sweep (audit-log-list, user-list,
  document-templates merge tokens, document-signing email). Rest of
  the ~100 sites stay rolling.

Quality gates: 1420/1420 vitest (46 new tests above baseline of 1374),
tsc clean, 0 lint errors.

Plan: docs/superpowers/plans/2026-05-18-audit-cleanup-completion.md
Migration: 0075_c2_document_events_recipient_email.sql (applied to dev DB).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -164,7 +164,7 @@ After `db:push` or applying a migration via `psql` against a running dev server,
 ### Send-from accounts (sales send-outs)
 
 - Configurable via `system_settings`; defaults to `sales@portnimara.com` (human) + `noreply@portnimara.com` (automation). SMTP/IMAP passwords AES-256-GCM at rest; API returns only `*PassIsSet` markers.
-- Audit → `document_sends` (separate from `audit_logs` for volume + binary refs). Body markdown rendered via `renderEmailBody()` (escape-then-allowlist; XSS-tested). Rate limit 50 sends/user/hour. Files > `email_attach_threshold_mb` ship as 24h signed-URL link (filename HTML-escaped against injection). Bounce monitoring needs IMAP creds in addition to SMTP — without them, the size-rejection banner is disabled.
+- Audit → `document_sends` (separate from `audit_logs` for volume + binary refs). Body markdown rendered via `renderEmailBody()` (escape-then-allowlist; XSS-tested). Rate limit 50 sends/user/hour. Files > `email_attach_threshold_mb` ship as 24h signed-URL link (filename HTML-escaped against injection). The threshold banner in the compose UI is informational and shows whenever the preview API returns the per-port threshold — it does NOT depend on IMAP. Separately, bounce monitoring (`imap-bounce-poller.ts`) needs IMAP creds and no-ops cleanly when they're unset.
 
 ### Pre-commit