Robo Tito retro rocket flare when falling

## Feature Request

Add a visual "retro rocket" flare effect for Robo Tito when he's falling.

## Description

When Robo Tito is falling, display a flickering missile "flame" beneath him to simulate retro rocket propulsion. This would be a visual enhancement that adds character to Robo Tito's movement.

## Implementation Notes

- Show missile sprite/effect beneath Robo Tito when falling
- Flame should flicker/animate to create visual interest
- Only active during falling state (not when grounded or jumping up)
- Should be visually distinct and add to Robo Tito's character identity

## Character Context

Robo Tito is a robot character, so retro rocket propulsion fits his mechanical nature.

## Priority

Future consideration - visual enhancement, not gameplay critical.