extends Node
## Pure signal hub — notification-only, no state, no callbacks back into singletons.
##
## Subsystems mutate themselves; this bus only spreads the news. Add signals as
## features land — keep this file readable. See docs/architecture.md.

# Phase 0 placeholder — no signals yet.
# Phase 1 will add tick / speed-change / pause signals.
# Phase 2 will add pawn-state signals (selected, deselected, walking, …).