fix: auto-create data/ directory in DataRecorder to prevent ENOENT on fresh clone

[Suyog241005]

Problem

Running npm run start on a fresh clone fails with:

Error: ENOENT: no such file or directory, open './data/initialTopicRepoData-.csv'

This happens because dataRecorder.js tries to write a CSV file to ./data/ which doesn't exist in the repo.

Steps to Reproduce

1. Clone the repo fresh
2. Set up .env with GITHUB_TOKEN and TOPIC
3. Run npm run start inside projects/initial-data/
4. Observe the crash