refactor(cli): remove npx wrapper and point bin directly at bmad-cli

The wrapper was a workaround for npx-from-GitHub tarball execution
(v4-alpha era). Since the project moved to npm registry publishing,
the wrapper cwd preservation and npx detection are unnecessary --
process.cwd() is correct in both local and npx require() paths.

- Delete tools/bmad-npx-wrapper.js
- Add shebang to tools/cli/bmad-cli.js
- Update package.json bin entries to point at bmad-cli.js directly

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -20,8 +20,8 @@
   "author": "Brian (BMad) Madison",
   "main": "tools/cli/bmad-cli.js",
   "bin": {
-    "bmad": "tools/bmad-npx-wrapper.js",
-    "bmad-method": "tools/bmad-npx-wrapper.js"
+    "bmad": "tools/cli/bmad-cli.js",
+    "bmad-method": "tools/cli/bmad-cli.js"
   },
   "scripts": {
     "bmad:install": "node tools/cli/bmad-cli.js install",

tools/bmad-npx-wrapper.js

@@ -1,38 +0,0 @@
-#!/usr/bin/env node
-
-/**
- * BMad Method CLI - Direct execution wrapper for npx
- * This file ensures proper execution when run via npx from GitHub or npm registry
- */
-
-const { execSync } = require('node:child_process');
-const path = require('node:path');
-const fs = require('node:fs');
-
-// Check if we're running in an npx temporary directory
-const isNpxExecution = __dirname.includes('_npx') || __dirname.includes('.npm');
-
-if (isNpxExecution) {
-  // Running via npx - spawn child process to preserve user's working directory
-  const args = process.argv.slice(2);
-  const bmadCliPath = path.join(__dirname, 'cli', 'bmad-cli.js');
-
-  if (!fs.existsSync(bmadCliPath)) {
-    console.error('Error: Could not find bmad-cli.js at', bmadCliPath);
-    console.error('Current directory:', __dirname);
-    process.exit(1);
-  }
-
-  try {
-    // Execute CLI from user's working directory (process.cwd()), not npm cache
-    execSync(`node "${bmadCliPath}" ${args.join(' ')}`, {
-      stdio: 'inherit',
-      cwd: process.cwd(), // This preserves the user's working directory
-    });
-  } catch (error) {
-    process.exit(error.status || 1);
-  }
-} else {
-  // Local execution - use require
-  require('./cli/bmad-cli.js');
-}

tools/cli/bmad-cli.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 const { program } = require('commander');
 const path = require('node:path');
 const fs = require('node:fs');