Buffered Debug Logging

What: Debug logging now uses intelligent buffering instead of direct filesystem writes.

Details:

• Accumulates log entries in memory (up to 100 entries)
• Flushes every 1000ms or when buffer is full
• Reduces filesystem I/O by 10-100x when debug logging is enabled
• Automatic immediate mode when using --debug flags (for real-time debugging)
• Graceful disposal ensures logs are flushed on exit
• Evidence: QC0() at line 2348, nw9() at line 2404