[bug]: Improve CodeChef Scraper Robustness

### Problem
- `/ccverify` relies on fragile page selectors and assumes table rows exist, which can crash when page layout changes or profile data is missing.

### Proposed Work
- Add null checks before indexing DOM collections.
- Improve selector fallback strategy.
- Return actionable user-facing error messages.

### Acceptance Criteria
- Command does not throw uncaught exceptions on missing selectors/rows.
- Clear reply is sent when scraping data is unavailable.

Start at the `/ccverify` command and trace its CodeChef scraping flow, focusing on DOM selectors and table-row access. Verify behavior when selectors or profile data are missing, then confirm that the command avoids uncaught exceptions and sends a clear reply when scraping data is unavailable.

Written by the indexing model from the issue text.