Method trackExports

src/utils/usage-tracker.ts:733–736

* Track exports from a file

(filePath: string, fileExports: FileExport[])

   * Track exports from a file
   */
  trackExports(filePath: string, fileExports: FileExport[]): void {
    const normalized = this.normalizePath(filePath);
    this.exports.set(normalized, fileExports);
  }

  /**
   * Find all circular dependencies in the graph using DFS with recursion stack.