feat: add DAVE adaptive synthetic persona

test/terminal-agent.test.mjs

@@ -112,6 +112,9 @@ test('step exhaustion uses a final-only prompt and returns synthesized evidence'
   assert.equal(result.answer, 'The available evidence does not confirm the claim.');
   assert.match(prompts[1], /Tool use is finished and unavailable/);
   assert.doesNotMatch(prompts[1], /ALLOWLISTED TOOLS/);
+  assert.match(prompts[0], /Your name is DAVE/);
+  assert.match(prompts[0], /ADAPTIVE WRITING STYLE/);
+  assert.match(prompts[1], /Your name is DAVE/);
 });
 
 test('repeated tool calls during finalization fail closed without leaking protocol JSON', async () => {