fix: align DeepSeek canary tool rounds with gate

deepseek-no-think-proxy.test.mjs

@@ -1,6 +1,7 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
 import {
+  DEEPSEEK_COMPAT_CONTRACT_VERSION,
   decodedUpstreamResponseHeaders,
   deepseekDisableThinkingEnabled,
   flattenLocalJsonSchemaRefs,
@@ -10,6 +11,7 @@ import {
   resolveDeepseekNoThinkProxyBaseUrl,
   resolveMoonshotCompatProxyBaseUrl,
   sanitizeMoonshotToolSchemas,
+  startDeepseekNoThinkProxy,
 } from './deepseek-no-think-proxy.mjs';
 
 test('injectDeepseekThinkingDisabled adds thinking.disabled when absent', () => {
@@ -168,3 +170,22 @@ test('decodedUpstreamResponseHeaders drops stale compression metadata', () => {
     'content-type': 'text/event-stream',
   });
 });
+
+test('compatibility proxy health identifies the enforced production contract', async (t) => {
+  const server = await startDeepseekNoThinkProxy({
+    host: '127.0.0.1',
+    port: 0,
+    logger: { info() {}, warn() {}, error() {} },
+  });
+  t.after(() => new Promise((resolve) => server.close(resolve)));
+  const address = server.address();
+  const response = await fetch(`http://127.0.0.1:${address.port}/health`);
+  assert.equal(response.status, 200);
+  assert.deepEqual(await response.json(), {
+    ok: true,
+    contractVersion: DEEPSEEK_COMPAT_CONTRACT_VERSION,
+    deepseekThinking: 'disabled',
+    upstream: 'https://api.deepseek.com',
+    moonshotUpstream: 'https://api.moonshot.cn',
+  });
+});