feat(cortex): no-show casus — intent flow, brief-rescript en document artifact

Cortex handelt een no-show af vanuit één chatcommando: afspraak
annuleren (declarabiliteits-nudge), en de openstaande concept-
huisartsbrief wordt via LLM herschreven en ter review aangeboden
in een document artifact (human-in-the-loop, PATCH dispatch zet
status op verzendklaar).

- API-routes: context, rescript, cancel, dispatch
- NoShowDocumentBlock: review/edit UI met origineel-vergelijk
- Mock-data voor concept huisartsbrief
- PRD, FO, bouwplan en epics in docs/intent/noshow-case/

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/api/cortex/noshow/context/route.ts

@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { createClient } from '@/lib/auth/server';
+import { isMockPatient, MOCK_CONCEPT_BRIEF } from '@/lib/cortex/mock-data/noshow';
+
+export async function GET(request: NextRequest) {
+  const supabase = await createClient();
+  const { data: { user }, error: authError } = await supabase.auth.getUser();
+  if (authError || !user) {
+    return NextResponse.json({ error: 'Niet geautoriseerd' }, { status: 401 });
+  }
+
+  const { searchParams } = new URL(request.url);
+  const patientId = searchParams.get('patientId');
+
+  if (!patientId) {
+    return NextResponse.json({ error: 'patientId is verplicht' }, { status: 400 });
+  }
+
+  // Mock path — demo flow
+  if (isMockPatient(patientId)) {
+    return NextResponse.json({
+      hasConceptBrief: true,
+      document: {
+        id: MOCK_CONCEPT_BRIEF.id,
+        title: MOCK_CONCEPT_BRIEF.title,
+        content: MOCK_CONCEPT_BRIEF.content,
+        type: MOCK_CONCEPT_BRIEF.type,
+        createdAt: MOCK_CONCEPT_BRIEF.createdAt,
+      },
+    });
+  }
+
+  // Productie path
+  const { data, error } = await supabase
+    .from('reports')
+    .select('id, content, structured_data, type, created_at')
+    .eq('patient_id', patientId)
+    .eq('type', 'huisartsbrief')
+    .is('deleted_at', null)
+    .order('created_at', { ascending: false })
+    .limit(1)
+    .single();
+
+  if (error || !data) {
+    return NextResponse.json({ hasConceptBrief: false });
+  }
+
+  const content = (data.structured_data as Record<string, unknown>)?.content as string
+    ?? data.content
+    ?? '';
+
+  return NextResponse.json({
+    hasConceptBrief: true,
+    document: {
+      id: data.id,
+      title: 'Huisartsbrief',
+      content,
+      type: data.type,
+      createdAt: data.created_at,
+    },
+  });
+}