Traceroute devlog #2

The path-drawing system was refactored around immutable game state so undo can work correctly.

That core change touched several tested rules and fixed issues like empty leftover data, self-intersection handling, and a bounce-back animation bug.

The project also added automatic build/deploy support, a colorblind-friendly palette, and completed tests for click-based path rules.

Work has now begun on the level-completion logic.