Lazy Chunks

Fixed some pretty major issues that were causing stutters instead of preventing them (oops). Here's what changed:

• FPS smoothing - No longer freaks out from frame-to-frame FPS fluctuations
• Fixed budget calculation - Was accidentally processing one extra heavy chunk per frame, causing the exact stutters we were trying to prevent
• Time-based limits - Hard caps processing time per frame so even worst-case scenarios stay smooth
• Teleport protection - Detects when you teleport or change dimensions and throttles extra hard during the chunk loading spike
• Proactive throttling - Watches for performance instability and backs off before stutters happen, not after

New config options if you wanna tweak things. Delete your old config to get the new defaults.

• 85d89f2