feat(sdk): support max output tokens

packages/sdk/sdk-client/tests/sdk-client.spec.ts

@@ -105,7 +105,7 @@ describe('DeepSeekHarness', () => {
     await harness.close()
   })
 
-  it('sends the configured cwd/provider/model in the handshake exactly once', async () => {
+  it('sends the configured cwd/provider/model/maxTokens in the handshake exactly once', async () => {
     const dir = await tempDir('sdk-client-init-')
     const recordFile = join(dir, 'init.jsonl')
     const harness = new DeepSeekHarness({
@@ -113,13 +113,19 @@ describe('DeepSeekHarness', () => {
       cwd: dir,
       provider: 'custom-provider',
       model: 'custom-model',
+      maxTokens: 4096,
     })
     cleanups.push(() => harness.close())
     await harness.run('one')
     await harness.run('two')
     await harness.close()
     const records = (await readFile(recordFile, 'utf8')).trim().split('\n').map(line => JSON.parse(line) as object)
-    expect(records).toEqual([{ cwd: dir, provider: 'custom-provider', model: 'custom-model' }])
+    expect(records).toEqual([{
+      cwd: dir,
+      provider: 'custom-provider',
+      model: 'custom-model',
+      maxTokens: 4096,
+    }])
   })
 
   it('resolves a relative launch cwd to an absolute workspace before the handshake', async () => {