feat: restore Codex CLI backend

Add back Codex CLI alongside Claude Code CLI and API backends.
All three backends are now available in the settings dropdown.

Change-Id: If93e0e93b724bf0dc18308d54f8d39b47c55deb4

README.md

@@ -36,6 +36,7 @@
 |------|------|
 | **API / Provider**（默认） | 直连 LLM API，支持 20+ provider |
 | **Claude Code CLI** | 通过本地 `claude -p` 调用，复用 Claude Code 登录态 |
+| **Codex CLI** | 通过本地 `codex exec` 调用，复用 Codex 登录态 |
 
 ### API / Provider 模式
 
@@ -52,16 +53,16 @@
 
 Model ID 支持 `provider/model` 写法（如 `anthropic/claude-sonnet-4-6`），匹配当前 preset 时自动剥离前缀。
 
-### Claude Code CLI 模式
+### CLI 模式（Claude Code / Codex）
 
-切换后端为 **Claude Code CLI**，插件通过 `claude -p --output-format json` 调用本地 Claude Code。
+切换后端为 **Claude Code CLI** 或 **Codex CLI**，插件通过本地 CLI 调用 LLM。
 
-Obsidian 从 GUI 启动时不继承 shell `PATH`，需要在设置中填写 `claude` 的绝对路径：
+Obsidian 从 GUI 启动时不继承 shell `PATH`，需要在设置中填写 CLI 的绝对路径：
 
 ```bash
-# 查看你的 claude 路径
-which claude
-# 例如：/Users/you/.claude/local/claude
+# 查看路径
+which claude    # Claude Code
+which codex     # Codex
 ```
 
 在插件设置的 **CLI 路径** 中填入该路径，点击 **Test** 验证。

main.ts

@@ -3,7 +3,7 @@ import { MarkdownView, Notice, Plugin, requestUrl, TFile } from 'obsidian';
 import { findLineForAnchor } from './src/anchor';
 import { serializeCacheFile, shouldConfirmRegenerate, touchCacheEntry } from './src/cache';
 import { activeIndexAfterCardDelete, removeCardAt, updateCardAt } from './src/cards';
-import { resolveCliPath, summarizeViaClaudeCode } from './src/cli';
+import { resolveCliPath, summarizeViaClaudeCode, summarizeViaCodex } from './src/cli';
 import {
   classifyGenerationError,
   type GenerationJob,
@@ -57,18 +57,25 @@ async function summarizeDocument(
 ) {
   const { system, user } = buildPrompts(content, settings);
   let cards: RawCard[];
-  if (settings.backend === 'claude-code') {
-    cards = await summarizeViaClaudeCode(system, user, settings, job);
-  } else {
-    const useStreaming = supportsStreaming(settings);
-    const abortController = useStreaming ? new AbortController() : null;
-    if (abortController) {
-      job.onCancel(() => abortController.abort());
-    }
-    if (useStreaming) {
-      cards = await summarizeViaApiStreaming(system, user, settings, onStreamProgress, abortController!.signal);
-    } else {
-      cards = await summarizeViaApi(requestUrl, system, user, settings);
+  switch (settings.backend) {
+    case 'claude-code':
+      cards = await summarizeViaClaudeCode(system, user, settings, job);
+      break;
+    case 'codex':
+      cards = await summarizeViaCodex(system, user, settings, job);
+      break;
+    default: {
+      const useStreaming = supportsStreaming(settings);
+      const abortController = useStreaming ? new AbortController() : null;
+      if (abortController) {
+        job.onCancel(() => abortController.abort());
+      }
+      if (useStreaming) {
+        cards = await summarizeViaApiStreaming(system, user, settings, onStreamProgress, abortController!.signal);
+      } else {
+        cards = await summarizeViaApi(requestUrl, system, user, settings);
+      }
+      break;
     }
   }
   const resolved: ResolvedCard[] = cards.map((c) => ({

src/settings-tab.ts

@@ -23,6 +23,11 @@ async function testBackend(settings: PluginSettings) {
     const { stdout } = await runCli(cmd, ['--version'], '', 10000);
     return `claude @ ${cmd}\n${stdout.trim()}`;
   }
+  if (settings.backend === 'codex') {
+    const cmd = resolveCliPath('codex', settings.cliPath);
+    const { stdout } = await runCli(cmd, ['--version'], '', 10000);
+    return `codex @ ${cmd}\n${stdout.trim()}`;
+  }
   return testApiBackend(requestUrl, settings);
 }
 
@@ -61,6 +66,7 @@ export class ParallelReaderSettingTab extends PluginSettingTab {
         d
           .addOption('api', 'API / Provider')
           .addOption('claude-code', 'Claude Code CLI')
+          .addOption('codex', 'Codex CLI')
           .setValue(this.plugin.settings.backend)
           .onChange(async (v) => {
             this.plugin.settings.backend = v;
@@ -72,7 +78,7 @@ export class ParallelReaderSettingTab extends PluginSettingTab {
           }),
       );
 
-    const isCliBacked = this.plugin.settings.backend === 'claude-code';
+    const isCliBacked = this.plugin.settings.backend === 'claude-code' || this.plugin.settings.backend === 'codex';
 
     if (isCliBacked) {
       new Setting(containerEl)