feat: improve semantic-release automation and disable manual version bumping

- Add custom semantic-release plugin to sync installer package.json
- Update semantic-release config to include installer package.json in releases
- Disable manual version bump script in favor of conventional commits
- Add helper script for version synchronization
- This ensures semantic-release fully manages both package.json files

BREAKING CHANGE: Manual version bumping via npm scripts is now disabled. Use conventional commits for automated releases.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tools/semantic-release-sync-installer.js

@@ -0,0 +1,31 @@
+/**
+ * Semantic-release plugin to sync installer package.json version
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+function prepare(pluginConfig, context) {
+  const { nextRelease, logger } = context;
+  
+  // Path to installer package.json
+  const installerPackagePath = path.join(process.cwd(), 'tools', 'installer', 'package.json');
+  
+  if (!fs.existsSync(installerPackagePath)) {
+    logger.log('Installer package.json not found, skipping sync');
+    return;
+  }
+  
+  // Read installer package.json
+  const installerPackage = JSON.parse(fs.readFileSync(installerPackagePath, 'utf8'));
+  
+  // Update version
+  installerPackage.version = nextRelease.version;
+  
+  // Write back
+  fs.writeFileSync(installerPackagePath, JSON.stringify(installerPackage, null, 2) + '\n');
+  
+  logger.log(`Synced installer package.json to version ${nextRelease.version}`);
+}
+
+module.exports = { prepare };