Remove SessionManager after refactoring

[bhouston]

Remove SessionManager after refactoring

Now that we have refactored the SessionManager functionality into SessionTracker (PR #312), we need to complete the refactoring by:

1. Updating any code that directly uses SessionManager to use SessionTracker instead
2. Removing the SessionManager class once all references are updated
3. Ensuring all tests still pass after the removal

Tasks

• Identify any remaining code that directly uses SessionManager
• Update those references to use SessionTracker instead
• Remove the SessionManager.ts file
• Run tests to ensure everything still works
• Update documentation if needed

Technical Details

• This is the follow-up to issue Refactor SessionManager into SessionTracker #311 and PR Refactor SessionManager functionality into SessionTracker #312
• The SessionTracker now has all the functionality of SessionManager
• We need to complete the refactoring by removing the now-redundant SessionManager class

Impact

This change will complete the refactoring process, reducing code duplication and simplifying the codebase.

[bhouston]

not required.