Add prestige graph

core/prestige/prestige_buff_node.gd

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+## A single node in the prestige buff graph.
+## Each node represents a permanent upgrade that persists across prestige resets and is purchased with prestige currency.
+class_name PrestigeBuffNode
+extends Resource
+
+enum EffectType {
+	CURRENCY_PRODUCTION_MULTIPLIER,  ## Multiply currency output by x%
+	BUILDING_CREATION_BONUS,         ## When a building is created, increase currency gain by x%
+	WORKER_THRESHOLD_MULTIPLIER,     ## When 10+ workers are assigned to a building, increase currency gain by x%
+	CARRYOVER_BUILDINGS,             ## After prestige, start with some buildings and workers already assigned
+	UNLOCK_AUTO_BUY_WORKER,          ## Unlock option to auto-buy workers
+	HOVER_SPEED_BOOST,               ## Hovering over a place speeds up workers instead of clicking
+	UNLOCK_BUILDING,                  ## Unlock a new building (generator)
+	WORKER_PRODUCTIVITY,             ## Increase worker productivity by x%
+	RESEARCH_XP_MULTIPLIER,          ## Increase research XP gain by x%
+}
+
+## Unique node identifier.
+@export var id: StringName = &""
+## UI display label.
+@export var display_name: String = ""
+## Tooltip / description text.
+@export_multiline var description: String = ""
+## Icon shown in the graph UI.
+@export var icon: Texture2D
+## Prerequisite node IDs that must be unlocked before this node becomes available.
+@export var parent_ids: Array[StringName] = []
+## What kind of effect this buff provides.
+@export var effect_type: EffectType = EffectType.CURRENCY_PRODUCTION_MULTIPLIER
+## Magnitude of the effect (interpreted per effect type).
+@export var effect_value: float = 1.0
+## Target generator, building, or currency ID for type-specific effects. Empty means global.
+@export var target_id: StringName = &""
+## Prestige currency cost mantissa (combined with cost_exponent for BigNumber).
+@export var cost_mantissa: float = 1.0
+## Prestige currency cost exponent (combined with cost_mantissa for BigNumber).
+@export var cost_exponent: int = 0
+## Visual tier / row in the graph UI.
+@export var tier: int = 0
+## Visual column / horizontal position in the graph UI.
+@export var x_position: float = 0.0
+
+
+## Builds and returns the fixed prestige currency cost as a BigNumber.
+func get_cost() -> BigNumber:
+	return BigNumber.new(cost_mantissa, cost_exponent)
+
+
+## Returns true if this node has any prerequisite parent nodes.
+func has_parents() -> bool:
+	return not parent_ids.is_empty()
+
+
+## Checks whether all prerequisites are unlocked in the provided dictionary.
+## [param unlocked] maps node_id (StringName) → bool (true if unlocked).
+func all_parents_unlocked(unlocked: Dictionary) -> bool:
+	for parent_id in parent_ids:
+		if not bool(unlocked.get(parent_id, false)):
+			return false
+	return true
+
+
+## Returns true if this node has valid required data (non-empty id, positive cost).
+func is_valid() -> bool:
+	if id == &"":
+		return false
+	if cost_mantissa <= 0.0:
+		return false
+	return true