feat: add paperless intake triage workflow

n8n-workflows/fixtures/paperless-intake-document.example.json

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+{
+  "id": 12345,
+  "title": "scan_2026_05_12",
+  "original_filename": "utility_statement_may.pdf",
+  "created": "2026-05-12",
+  "added": "2026-05-13T02:14:00Z",
+  "correspondent_detail": {"name": "CDE Lightband"},
+  "document_type_detail": {"name": "Statement"},
+  "tags_detail": [{"name": "inbox"}],
+  "content": "CDE Lightband monthly utility statement. Amount due $142.17. Payment due by 2026-06-05."
+}

n8n-workflows/fixtures/paperless-intake-expected-triage.example.json

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+{
+  "summary": "Monthly utility bill from CDE Lightband for $142.17 due on 2026-06-05.",
+  "suggested_title": "CDE Lightband Utility Bill - May 2026",
+  "document_type": "bill",
+  "suggested_correspondent": "CDE Lightband",
+  "suggested_tags": ["paperless-triage", "utility", "bill"],
+  "due_date": "2026-06-05",
+  "needs_review": true,
+  "urgency": "medium",
+  "reason": "Contains a payment due date; safety gate requires human review.",
+  "confidence": "high"
+}

n8n-workflows/fixtures/paperless-intake-webhook.example.json

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+{
+  "document_id": 12345
+}