fix: enforce security profile language across DAVE

test/terminal-agent.test.mjs

@@ -131,6 +131,30 @@ test('repeated tool calls during finalization fail closed without leaking protoc
   assert.equal(result.notify, false);
 });
 
+test('agent propagates preferred German language through tool and finalization prompts', async () => {
+  const prompts = [];
+  let call = 0;
+  const agent = new TerminalAgent({
+    provider: {
+      isConfigured: true,
+      async complete(systemPrompt) {
+        prompts.push(systemPrompt);
+        call++;
+        return call === 1
+          ? { text: JSON.stringify({ type: 'tool_call', tool: 'get_status', arguments: {}, rationale: 'Status prüfen' }) }
+          : { text: JSON.stringify({ type: 'final', answer: 'Die Systemlage ist stabil.', confidence: 'high', evidence: [], notify: false, priority: 'routine' }) };
+      },
+    },
+    registry: new TerminalToolRegistry([{ name: 'get_status', handler: async () => ({ status: 'healthy' }) }]),
+    maxSteps: 1,
+  });
+
+  const result = await agent.run('Lage?', { preferredLanguage: 'de' });
+  assert.equal(result.answer, 'Die Systemlage ist stabil.');
+  assert.match(prompts[0], /REQUIRED RESPONSE LANGUAGE: German \(de\)/);
+  assert.match(prompts[1], /REQUIRED RESPONSE LANGUAGE: German \(de\)/);
+});
+
 test('scheduled presence cannot create pending mutating actions', async () => {
   let executions = 0;
   const agent = new TerminalAgent({