feat(documenso): v2 coverage on getDocument/health + reminder webhook + admin UI benefits panel

- documenso-client.ts: getDocument now routes to /api/v2/envelope/{id} when port apiVersion=v2; checkDocumensoHealth surfaces resolved apiVersion for the admin Test button
- webhook route: handle DOCUMENT_REMINDER_SENT (structured log only, no audit-table noise) + DOCUMENT_CREATED / DOCUMENT_SENT (informational log)
- Admin Documenso page: prominent v1-vs-v2 explainer card listing v2-only capabilities the CRM already exploits (bulk fields, percent coords, richer fieldMeta, v2 webhook aliases, envelope endpoints) + amber roadmap callout for sequential signing / redirectUrl / template/use / envelope/update / non-SIGNER roles
- CLAUDE.md: idempotency + v2 webhook event list, berth-rules engine section, DOCUMENSO_API_URL gotcha, storage backend listByPrefix + timeout

Still v1-only (call out in admin UI roadmap): createDocument, generateDocumentFromTemplate, sendDocument, sendReminder, downloadSignedPdf. Migrating template/use to v2 requires per-template field-ID mapping in template config; deferred to a follow-up plan.

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

src/app/api/webhooks/documenso/route.ts

@@ -235,6 +235,29 @@ export async function POST(req: NextRequest): Promise<NextResponse> {
         await handleDocumentExpired({ documentId: documensoId, ...portScope });
         break;
 
+      case 'DOCUMENT_REMINDER_SENT':
+        // Documenso auto-reminded a recipient. We don't mutate state — the
+        // reminder is informational. Structured log line is enough for
+        // telemetry without polluting the audit_logs table on every
+        // auto-reminder Documenso sends across all ports.
+        logger.info(
+          {
+            documensoId,
+            recipients: recipients.map((r) => r.email),
+            ...portScope,
+          },
+          'Documenso auto-reminder sent',
+        );
+        break;
+
+      case 'DOCUMENT_CREATED':
+      case 'DOCUMENT_SENT':
+        // Created + sent are informational — we initiated these from our
+        // side so the state is already authoritative in our DB. Log for
+        // forward-compat / out-of-band-creation telemetry.
+        logger.info({ event, documensoId, ...portScope }, 'Documenso lifecycle event');
+        break;
+
       default:
         logger.info({ event }, 'Unhandled Documenso webhook event type');
     }