feat: 开源发布 — 完整 README、MIT 许可证、22+ 大模型厂商支持

- 重写 README.md：项目简介、快速开始、22+ 厂商列表、功能特性、架构说明、配置指南、FAQ、贡献指南
- 新增 MIT LICENSE
- 包含全部源码与文档

src/entrypoints/cli.tsx

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 // Runtime polyfill for bun:bundle (build-time macros)
-const feature = (_name: string) => false;
+const feature = (name: string) => name === 'BUDDY';
 if (typeof globalThis.MACRO === "undefined") {
     (globalThis as any).MACRO = {
         VERSION: "2.1.888",
@@ -84,8 +84,17 @@ async function main(): Promise<void> {
         if (args[0] === "--setup" || args[0] === "setup") {
             const config = await runSetupWizard();
             applyConfig(config);
+            // Store companion for deferred write after config system is ready
+            if (config.companion) {
+                (globalThis as any).__pendingCompanion = config.companion;
+            }
             // Remove --setup from args so the CLI doesn't try to parse it
             args.shift();
+            // Also remove from process.argv so Commander.js doesn't see it
+            const setupIdx = process.argv.indexOf("--setup");
+            if (setupIdx !== -1) process.argv.splice(setupIdx, 1);
+            const setupIdx2 = process.argv.indexOf("setup");
+            if (setupIdx2 !== -1) process.argv.splice(setupIdx2, 1);
             if (args.length === 0) {
                 // Continue to normal REPL
             }
@@ -93,6 +102,9 @@ async function main(): Promise<void> {
             // First run, no config, no Anthropic key, interactive mode → show wizard
             const config = await runSetupWizard();
             applyConfig(config);
+            if (config.companion) {
+                (globalThis as any).__pendingCompanion = config.companion;
+            }
         } else if (hasConfig()) {
             // Load saved config and apply to environment
             const config = loadConfig();