Optimized Terminal Rendering

What: New screen diffing algorithm that only updates changed characters instead of clearing and re-rendering the entire terminal, eliminating flicker and improving performance.

How it works: The renderer now:

1. Compares previous and current screen buffers character-by-character
2. Only updates positions where content changed
3. Manages cursor movement efficiently during incremental updates
4. Falls back to full re-render only when screen dimensions change

Details:

• Significantly reduces terminal flicker during updates
• Improves performance for large terminal windows
• Better user experience during streaming responses
• Implements transaction-based cursor management for atomic updates
• Evidence: Functions qRA() at line 70135, uR0() at line 70140, mR0() at line 70379, class dR0 at line 70395