feat(ccw): migrate backend to TypeScript

- Convert 40 JS files to TypeScript (CLI, tools, core, MCP server)
- Add Zod for runtime parameter validation
- Add type definitions in src/types/
- Keep src/templates/ as JavaScript (dashboard frontend)
- Update bin entries to use dist/
- Add tsconfig.json with strict mode
- Add backward-compatible exports for tests
- All 39 tests passing

Breaking changes: None (backward compatible)

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

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

ccw/src/utils/file-utils.ts

@@ -0,0 +1,48 @@
+import { readFileSync, existsSync, writeFileSync } from 'fs';
+import { join } from 'path';
+
+/**
+ * Safely read a JSON file
+ * @param filePath - Path to JSON file
+ * @returns Parsed JSON or null on error
+ */
+export function readJsonFile(filePath: string): unknown | null {
+  if (!existsSync(filePath)) return null;
+  try {
+    return JSON.parse(readFileSync(filePath, 'utf8'));
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Safely read a text file
+ * @param filePath - Path to text file
+ * @returns File contents or null on error
+ */
+export function readTextFile(filePath: string): string | null {
+  if (!existsSync(filePath)) return null;
+  try {
+    return readFileSync(filePath, 'utf8');
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Write content to a file
+ * @param filePath - Path to file
+ * @param content - Content to write
+ */
+export function writeTextFile(filePath: string, content: string): void {
+  writeFileSync(filePath, content, 'utf8');
+}
+
+/**
+ * Check if a path exists
+ * @param filePath - Path to check
+ * @returns True if path exists
+ */
+export function pathExists(filePath: string): boolean {
+  return existsSync(filePath);
+}