Changes
PR #1728 by ksylvan: Refactor Logging System to Use Centralized Debug Logger
- Replace fmt.Fprintf/os.Stderr with centralized debuglog.Log across CLI and add unconditional Log function for important messages
- Improve OAuth flow messaging and token refresh diagnostics with better error handling
- Update tests to capture debuglog output via SetOutput for better test coverage
- Convert Perplexity streaming errors to unified debug logging and emit file write notifications through debuglog
- Standardize extension registry warnings and announce large audio processing steps via centralized logger