feat: emit missing_precedent + export_complete webhooks to plugin

Adds two webhook emitters in paperclip_api.py that the plugin's
onWebhook handler now routes by ``eventType``:

* ``emit_missing_precedent_webhook(...)`` — fires from
  POST /api/missing-precedents on first insert (non-duplicate).
  The plugin surfaces an askUserQuestions interaction on the
  linked issue so Daphna can choose upload / irrelevant / defer
  without needing to open the legal-ai UI.

* ``emit_export_complete_webhook(...)`` — fires from
  POST /api/cases/{n}/export-docx after a successful export. The
  plugin attaches a "final-decision" markdown document with a
  download link to the linked Paperclip issue.

Both are fire-and-forget BackgroundTasks — failures are logged
but never block the originating request. Company resolution
follows the same 1xxx→licensing / 8-9xxx→betterment rule used
by emit_case_status_webhook.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/paperclip_api.py

@@ -100,6 +100,7 @@ async def emit_case_status_webhook(
             "POST",
             "/api/plugins/marcusgroup.legal-ai/webhooks/case-status",
             json={
+                "eventType": "status_change",
                 "caseNumber": case_number,
                 "oldStatus": old_status,
                 "newStatus": new_status,
@@ -114,3 +115,90 @@ async def emit_case_status_webhook(
             "emit_case_status_webhook failed for case %s (%s → %s): %s",
             case_number, old_status, new_status, exc,
         )
+
+
+async def emit_missing_precedent_webhook(
+    *,
+    case_number: str,
+    missing_precedent_id: str,
+    citation: str,
+    cited_by_party: str | None = None,
+    cited_by_party_name: str | None = None,
+    legal_topic: str | None = None,
+    legal_issue: str | None = None,
+    company_id: str | None = None,
+    run_id: str | None = None,
+) -> None:
+    """Tell the plugin that a missing precedent was logged for a case.
+
+    The plugin uses this to surface an ``askUserQuestions`` interaction
+    on the linked Paperclip issue so the chair can decide whether to
+    upload the cited precedent or mark it irrelevant.
+
+    Fire-and-forget.
+    """
+    try:
+        await pc_request(
+            "POST",
+            "/api/plugins/marcusgroup.legal-ai/webhooks/case-status",
+            json={
+                "eventType": "missing_precedent_created",
+                "caseNumber": case_number,
+                "companyId": company_id,
+                "timestamp": datetime.now(timezone.utc).isoformat(),
+                "missingPrecedent": {
+                    "id": missing_precedent_id,
+                    "citation": citation,
+                    "citedByParty": cited_by_party,
+                    "citedByPartyName": cited_by_party_name,
+                    "legalTopic": legal_topic,
+                    "legalIssue": legal_issue,
+                },
+            },
+            run_id=run_id,
+            timeout=5.0,
+        )
+    except Exception as exc:
+        logger.warning(
+            "emit_missing_precedent_webhook failed for case %s (%s): %s",
+            case_number, citation, exc,
+        )
+
+
+async def emit_export_complete_webhook(
+    *,
+    case_number: str,
+    docx_filename: str,
+    docx_title: str | None = None,
+    company_id: str | None = None,
+    run_id: str | None = None,
+) -> None:
+    """Tell the plugin that a final DOCX was exported for a case.
+
+    The plugin uses this to attach a "final decision" document to the
+    linked Paperclip issue (markdown body with a download link to the
+    DOCX). Binary attachment is intentionally avoided — the SDK's
+    ``documents.upsert`` accepts text only.
+
+    Fire-and-forget.
+    """
+    try:
+        await pc_request(
+            "POST",
+            "/api/plugins/marcusgroup.legal-ai/webhooks/case-status",
+            json={
+                "eventType": "export_complete",
+                "caseNumber": case_number,
+                "companyId": company_id,
+                "timestamp": datetime.now(timezone.utc).isoformat(),
+                "docxFilename": docx_filename,
+                "docxTitle": docx_title or f"החלטה סופית — {case_number}",
+            },
+            run_id=run_id,
+            timeout=5.0,
+        )
+    except Exception as exc:
+        logger.warning(
+            "emit_export_complete_webhook failed for case %s (%s): %s",
+            case_number, docx_filename, exc,
+        )