Chance a new Regular (Blue) agent is released on each tick (completely neutral).
Chance a new Picker (Green) agent is released on each tick (only picks up litter).
Chance a Picker successfully cleans a littered block when passing over it. Simulates capacity limits.
The baseline chance for *any* person to drop litter on their current block.
Multiplier applied to Base Drop Chance when street is perfectly clean (0 litter items).
The litter count where the street is considered "broken" and the High Multiplier begins to apply.
Multiplier applied to Base Drop Chance when litter exceeds the threshold.