Renewable resources: tree growth + WildGrowth + Quarry on BigRockNode

Trees: 4 growth stages (Sapling→Young→Growing→Mature), only Mature
yields wood. WildGrowth ticker fires every in-game hour; rejection-
samples grass tiles and plants a sapling with ~30% probability (capped
at MAP_TREE_LIMIT=60). New `paint_plant_tree` designation lets the
player manually plant — ghost sapling registered as a build_site that
ConstructionProvider fulfils. Stage round-trips through save/load.
Initial seed mixes 4 saplings + 6 mature so growth is visible day 1.

Quarry: new BigRockNode entity (2×2 permanent stone outcrop, never
depletes). 3 nodes seeded far from cabin. New QuarryWorkbench
(extends Workbench, auto-FOREVER `quarry_stone` bill, recipe drops
1 stone per 300 work-ticks). New `paint_quarry` designation only
accepts BigRockNode tiles. CraftingProvider now supports recipes
with `ingredient_count == 0` — skips ingredient-fetch and goes
straight to walk+craft toils. Recipe gains `ingredient_count` field
(defaults 0). Save/load layering: big_rock_node spawns at priority 0
(same as rock/tree), quarry_workbench at priority 2 (after the node).

UI: Plant tree + Build quarry buttons added to Build drawer.
build_drawer_thumb gains `plant_tree` (sapling sprout in dirt) and
`paint_quarry` (stone block + chisel + cut-stone pile) shapes.
inspect_tooltip recognises BigRockNode + shows tree growth stage on
hover.

Delegation: gdscript-refactor (Sonnet ×2) for trees full impl +
quarry skeleton; quick-edit (Haiku) for CraftingProvider no-ingredient
plumbing + TopBar polish; integration handled on Opus.

scenes/entities/big_rock_node.gd

@@ -0,0 +1,140 @@
+class_name BigRockNode extends Node2D
+## Permanent stone outcrop — a 2×2 immovable boulder that never depletes.
+##
+## BigRockNode marks its footprint impassable in the pathfinder and registers
+## itself with World so the designation system can locate it.  A QuarryWorkbench
+## can be built on one of its tiles; external code sets is_quarry_site = true
+## and quarry_workbench once construction completes.
+##
+## Draw convention: position is stamped at the TOP-LEFT pixel corner of the
+## 2×2 footprint (tile * TILE_SIZE_PX).  The visual centre of the 32×32 area
+## sits at local (16, 16), so all _draw_* helpers are centred there.
+##
+## Save/load: to_dict / from_dict round-trip tile + is_quarry_site.
+## The quarry_workbench reference is an entity pointer reconstructed by the
+## save layer (SaveSystem wires it after both entities are spawned).
+
+const TILE_SIZE_PX: int = 16
+
+## Top-left tile of the 2×2 footprint.
+var tile: Vector2i = Vector2i.ZERO
+
+## Footprint size in tiles (always 2×2; declared as a var so external code can
+## read it uniformly without special-casing BigRockNode vs hypothetical future nodes).
+var footprint: Vector2i = Vector2i(2, 2)
+
+## True once a Quarry workbench has been completed on this outcrop.
+## Flipped by external code (designation / world.gd) — this file only declares it.
+var is_quarry_site: bool = false
+
+## The QuarryWorkbench that sits on this node after construction.
+## null until assigned by the designation completion handler.
+var quarry_workbench = null
+
+
+# ── lifecycle ─────────────────────────────────────────────────────────────────
+
+func _ready() -> void:
+	# Position at top-left pixel corner so footprint_tiles() aligns with world coords.
+	position = Vector2(tile.x * TILE_SIZE_PX, tile.y * TILE_SIZE_PX)
+	# Block pathfinding on every tile in the footprint.
+	for t in footprint_tiles():
+		if World.pathfinder != null:
+			World.pathfinder.set_cell_walkable(t, false)
+	World.register_big_rock_node(self)
+	queue_redraw()
+
+
+func _exit_tree() -> void:
+	World.unregister_big_rock_node(self)
+
+
+# ── public API ────────────────────────────────────────────────────────────────
+
+## One-shot initialiser. Call after add_child() so _ready() has fired.
+func setup(p_tile: Vector2i) -> void:
+	tile = p_tile
+	position = Vector2(tile.x * TILE_SIZE_PX, tile.y * TILE_SIZE_PX)
+	queue_redraw()
+	Audit.log("big_rock_node", "spawned at tile %s" % tile)
+
+
+## Returns the four tiles covered by this node's 2×2 footprint.
+## Used by designation, save/load, and inspection code.
+func footprint_tiles() -> Array[Vector2i]:
+	return [
+		tile,
+		tile + Vector2i(1, 0),
+		tile + Vector2i(0, 1),
+		tile + Vector2i(1, 1),
+	]
+
+
+## True when tile_to_check falls inside the 2×2 footprint.
+func is_at(tile_to_check: Vector2i) -> bool:
+	return (
+		tile_to_check.x >= tile.x and tile_to_check.x < tile.x + footprint.x
+		and tile_to_check.y >= tile.y and tile_to_check.y < tile.y + footprint.y
+	)
+
+
+# ── save / load ───────────────────────────────────────────────────────────────
+
+func to_dict() -> Dictionary:
+	return {
+		"class_id": &"big_rock_node",
+		"tile_x": tile.x,
+		"tile_y": tile.y,
+		"is_quarry_site": is_quarry_site,
+	}
+
+
+## Restore from a dict produced by to_dict(). quarry_workbench is reconnected
+## by the save layer after both entities are spawned.
+static func from_dict(d: Dictionary) -> Dictionary:
+	return {
+		"tile_x": int(d.get("tile_x", 0)),
+		"tile_y": int(d.get("tile_y", 0)),
+		"is_quarry_site": bool(d.get("is_quarry_site", false)),
+	}
+
+
+# ── render ────────────────────────────────────────────────────────────────────
+
+## Draw a procedural pile of grey rocks centred at local (16, 16) —
+## the geometric centre of the 32×32 footprint area.
+## Three layers create depth: large base blob → medium mid rock → small cap.
+func _draw() -> void:
+	var cx: float = 16.0
+	var cy: float = 16.0
+
+	# Colour palette — warm grey tones suggesting weathered granite.
+	var base_fill   := Color(0.60, 0.58, 0.55)   # large base ellipse
+	var mid_fill    := Color(0.45, 0.44, 0.42)   # medium middle rock
+	var top_fill    := Color(0.55, 0.53, 0.50)   # small perched cap
+	var outline_col := Color(0.20, 0.18, 0.16, 0.70)   # subtle dark rim
+
+	# Bottom: large flattened blob — widest at the base to read as a ground-hugging mass.
+	var base_w: float = 24.0
+	var base_h: float = 16.0
+	var base_rect := Rect2(Vector2(cx - base_w / 2.0, cy - base_h / 2.0 + 2.0), Vector2(base_w, base_h))
+	draw_rect(base_rect, base_fill)
+
+	# Dark outline arc around the base blob.
+	draw_rect(base_rect, outline_col, false, 1.0)
+
+	# Middle: slightly elevated, narrower rock sitting on top of the base.
+	var mid_w: float = 16.0
+	var mid_h: float = 12.0
+	var mid_oy: float = -4.0   # shift up from centre
+	var mid_rect := Rect2(Vector2(cx - mid_w / 2.0, cy - mid_h / 2.0 + mid_oy), Vector2(mid_w, mid_h))
+	draw_rect(mid_rect, mid_fill)
+	draw_rect(mid_rect, outline_col, false, 1.0)
+
+	# Top: small cap perched on the very top.
+	var top_w: float = 8.0
+	var top_h: float = 6.0
+	var top_oy: float = -10.0   # above the mid rock
+	var top_rect := Rect2(Vector2(cx - top_w / 2.0, cy - top_h / 2.0 + top_oy), Vector2(top_w, top_h))
+	draw_rect(top_rect, top_fill)
+	draw_rect(top_rect, outline_col, false, 1.0)