allow proxy auto model selection

src/test/config.test.js

@@ -3,8 +3,8 @@ import assert from 'node:assert/strict';
 import { getLLMConfig, getOpenCodeHttpsAgent } from '../config.js';
 
 const ENV_KEYS = [
-  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'INPUT_CLI_PROXY_API', 'INPUT_CLI_PROXY_API_KEY',
-  'MODEL', 'OPENCODE_MODEL', 'INPUT_MODEL',
+  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'CLI_PROXY_API_MODEL', 'INPUT_CLI_PROXY_API', 'INPUT_CLI_PROXY_API_KEY', 'INPUT_MODEL',
+  'MODEL', 'OPENCODE_MODEL',
 ];
 
 let saved = {};
@@ -52,6 +52,16 @@ describe('getLLMConfig', () => {
     assert.equal(cfg.model, 'gpt-5-mini');
   });
 
+  it('uses CLI_PROXY_API_MODEL when INPUT_MODEL is missing', () => {
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.CLI_PROXY_API_MODEL = 'gpt-5.4-mini';
+    process.env.MODEL = 'gpt-5.5';
+
+    const cfg = getLLMConfig();
+
+    assert.equal(cfg.model, 'gpt-5.4-mini');
+  });
+
   it('returns null provider when CLI_PROXY_API is missing', () => {
     process.env.MODEL = 'gpt-5.5';
     const cfg = getLLMConfig();

src/test/llm.test.js

@@ -4,7 +4,7 @@ import axios from 'axios';
 import { extractBalancedJSON, extractJSONText, extractMeaningfulError, mapWithConcurrency } from '../llm.js';
 
 const ENV_KEYS = [
-  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'MODEL', 'INPUT_MODEL', 'OPENCODE_MODEL',
+  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'CLI_PROXY_API_MODEL', 'MODEL', 'INPUT_MODEL', 'OPENCODE_MODEL',
   'AI_ASSISTANT_TIMEOUT_MS', 'AI_ASSISTANT_MAX_BUFFER',
 ];
 
@@ -57,6 +57,25 @@ describe('chat - CLIProxyAPI', async () => {
     assert.equal(capturedOpts.headers.Authorization, 'Bearer secret');
   });
 
+  it('omits model from the request body when auto selection is allowed', async () => {
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.CLI_PROXY_API_KEY = 'secret';
+
+    let capturedBody;
+    mock.method(axios, 'post', async (url, body) => {
+      capturedBody = body;
+      return {
+        data: { choices: [{ message: { content: 'cli response' } }] },
+        headers: {},
+      };
+    });
+
+    const result = await chat('sys', 'user');
+
+    assert.equal(result, 'cli response');
+    assert.equal(Object.hasOwn(capturedBody, 'model'), false);
+  });
+
   it('throws an error when the API fails', async () => {
     process.env.CLI_PROXY_API = 'https://proxy.example';
     process.env.MODEL = 'gpt-5-mini';

src/test/main.test.js

@@ -131,6 +131,12 @@ describe('main pipeline', () => {
     assert.equal(await runMain(), 0);
   });
 
+  it('無 MODEL 仍可由 Proxy 自動選模並正常走完（exit 0）', async () => {
+    assert.equal(await runMain({
+      config: { getLLMConfig: () => ({ provider: 'cliproxyapi', apiKeys: ['secret'], baseURL: 'https://proxy.example', model: null, command: null }) },
+    }), 0);
+  });
+
   it('clone 失敗仍繼續、不因 commitAndPush 中斷（無 critical → exit 0）', async () => {
     assert.equal(await runMain({ git: { cloneRepo: () => { throw new Error('clone fail'); } } }), 0);
   });

src/test/preflight.test.js

@@ -4,7 +4,7 @@ import axios from 'axios';
 import { checkRequiredEnv, verifyGiteaToken, verifyCommentToken, verifyLLM, fetchLLMModels, runPreflight } from '../preflight.js';
 
 const LLM_ENV_KEYS = [
-  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'INPUT_CLI_PROXY_API', 'INPUT_CLI_PROXY_API_KEY',
+  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'CLI_PROXY_API_MODEL', 'INPUT_CLI_PROXY_API', 'INPUT_CLI_PROXY_API_KEY',
   'MODEL', 'OPENCODE_MODEL', 'INPUT_MODEL',
 ];
 
@@ -164,6 +164,22 @@ describe('verifyLLM', () => {
     assert.deepEqual(result.models, ['gpt-5.5', 'gpt-5.4-mini']);
   });
 
+  it('passes when no model is specified and the proxy is reachable', async () => {
+    clearLLMEnv();
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.CLI_PROXY_API_KEY = 'secret';
+
+    const result = await verifyLLM({
+      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5', 'gpt-5.4-mini'] }),
+    });
+
+    assert.equal(result.ok, true);
+    assert.equal(result.provider, 'cliproxyapi');
+    assert.equal(result.command, null);
+    assert.equal(result.model, null);
+    assert.deepEqual(result.models, ['gpt-5.5', 'gpt-5.4-mini']);
+  });
+
   it('fails when proxy auth is invalid', async () => {
     clearLLMEnv();
     process.env.CLI_PROXY_API = 'https://proxy.example';