feat: add workflow management commands and utilities

- Implemented workflow installation, listing, and syncing commands in `workflow.ts`.
- Created utility functions for project root detection and package version retrieval in `project-root.ts`.
- Added update checker functionality to notify users of new package versions in `update-checker.ts`.
- Developed unit tests for project root utilities and update checker to ensure functionality and version comparison accuracy.

ccw/src/utils/project-root.ts

@@ -0,0 +1,73 @@
+import { existsSync, readFileSync } from 'fs';
+import { dirname, join } from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+interface PackageInfo {
+  name: string;
+  version: string;
+  [key: string]: unknown;
+}
+
+/**
+ * Find project root by searching upward for package.json
+ * More robust than hardcoded relative paths
+ */
+export function findProjectRoot(startDir: string = __dirname): string | null {
+  let currentDir = startDir;
+  let previousDir = '';
+
+  // Traverse up until we find package.json or reach filesystem root
+  while (currentDir !== previousDir) {
+    const pkgPath = join(currentDir, 'package.json');
+    if (existsSync(pkgPath)) {
+      try {
+        const pkg = JSON.parse(readFileSync(pkgPath, 'utf8'));
+        // Verify this is our package (not a nested node_modules package)
+        if (pkg.name === 'claude-code-workflow' || pkg.bin?.ccw) {
+          return currentDir;
+        }
+      } catch {
+        // Invalid JSON, continue searching
+      }
+    }
+    previousDir = currentDir;
+    currentDir = dirname(currentDir);
+  }
+
+  return null;
+}
+
+/**
+ * Load package.json from project root
+ * Returns null if not found or invalid
+ */
+export function loadPackageInfo(): PackageInfo | null {
+  const projectRoot = findProjectRoot();
+  if (!projectRoot) return null;
+
+  const pkgPath = join(projectRoot, 'package.json');
+  try {
+    const content = readFileSync(pkgPath, 'utf8');
+    return JSON.parse(content) as PackageInfo;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Get package version from project root
+ */
+export function getPackageVersion(): string {
+  const pkg = loadPackageInfo();
+  return pkg?.version || '1.0.0';
+}
+
+/**
+ * Get package root directory
+ */
+export function getPackageRoot(): string {
+  return findProjectRoot() || join(__dirname, '..', '..', '..');
+}