Architecture

Runtime layers

Layer	Main types
Grid	TacticalGrid, TacticalCell, GridPathfinder, GridLineTrace
Map data	TacticalMapData, TacticalMapPalette, TacticalCellOverride
Units	TacticalUnit, UnitDefinition, AbilityLoadout
Combat	CombatResolver, CoverResolver, LineOfFireService, OverwatchSystem
Abilities	AbilityController, definitions, effects, and effect executor
Turn	TurnManager
Vision	GridVisibilitySystem, FogOfWarPresenter
AI	AlienTurnController, AlienSpawnSettings
Presentation	HUD, world HUD, feedback, range and cone visualizers
Animation	Profile, controller, actions, and event relay

Data-first extension

Prefer creating ScriptableObject assets for content variation. Write new runtime code when behavior changes, not when only values change.

Game-specific systems

Objectives, campaign progression, inventory, save games, dialogue, and mission generation are intentionally outside the core combat engine. Integrate them by subscribing to turn, unit, ability, and death events.