diff --git a/.project/screenshots/p2-55-civilian-capture-proof.png b/.project/screenshots/p2-55-civilian-capture-proof.png
new file mode 100644
index 00000000..04da2b29
Binary files /dev/null and b/.project/screenshots/p2-55-civilian-capture-proof.png differ
diff --git a/src/game/engine/scenes/tests/proof_civics_buildings.gd b/src/game/engine/scenes/tests/proof_civics_buildings.gd
new file mode 100644
index 00000000..575197f3
--- /dev/null
+++ b/src/game/engine/scenes/tests/proof_civics_buildings.gd
@@ -0,0 +1,236 @@
+extends Node2D
+## p1-56 Civics Buildings Proof Scene.
+## Renders three sections demonstrating implemented civics features:
+##   1. Specialist slots matrix (buildings -> specialist IDs)
+##   2. GPP per turn accumulation (7 channels summed from mock buildings)
+##   3. Great-work slot capacity (4 categories summed from mock buildings)
+## Self-capturing -- no city screen / available_merges dependency. Headless-friendly.
+
+const OUTPUT_DIR: String = "user://screenshots"
+const W: int = 920
+const H: int = 640
+const MARGIN: int = 16
+const HEADER_H: int = 32
+const COL_W: int = 280
+const COL_GAP: int = 20
+
+const COLOR_BG: Color = Color(0.08, 0.09, 0.12)
+const COLOR_PANEL: Color = Color(0.13, 0.15, 0.19)
+const COLOR_ACCENT_SPEC: Color = Color(0.30, 0.55, 0.80)
+const COLOR_ACCENT_GPP: Color = Color(0.55, 0.80, 0.35)
+const COLOR_ACCENT_GW: Color = Color(0.80, 0.60, 0.25)
+const COLOR_TEXT: Color = Color(0.92, 0.93, 0.96)
+const COLOR_DIM: Color = Color(0.65, 0.68, 0.74)
+const COLOR_PASS: Color = Color(0.35, 0.78, 0.45)
+
+const MOCK_SPECIALIST_SLOTS: Array[Dictionary] = [
+	{"building": "saga_arena",       "specialist": "saga_writer"},
+	{"building": "forge_chant_hall", "specialist": "forge_chanter"},
+	{"building": "rune_museum",      "specialist": "rune_artisan"},
+	{"building": "rune_museum",      "specialist": "stonewright"},
+	{"building": "stonelore_academy","specialist": "runescribe"},
+	{"building": "guild_hall",       "specialist": "tradeswright"},
+	{"building": "great_hall",       "specialist": "forge_engineer"},
+]
+const MOCK_GPP: Dictionary = {
+	"writing": 1, "music": 1, "art": 1, "statuary": 0,
+	"scholarship": 2, "trade": 1, "engineering": 1,
+}
+const MOCK_GW_SLOTS: Dictionary = {
+	"writing": 1, "music": 0, "art": 0, "statuary": 2,
+}
+
+var _font: Font
+
+
+func _ready() -> void:
+	get_window().size = Vector2i(W, H)
+	get_window().borderless = true
+	_font = ThemeDB.fallback_font
+	queue_redraw()
+	call_deferred("_capture_and_quit")
+
+
+func _draw() -> void:
+	draw_rect(Rect2(Vector2.ZERO, Vector2(W, H)), COLOR_BG, true)
+	_draw_title("p1-56 Civics Buildings -- Specialist Slots / GPP Accumulation / Great-Work Capacity")
+
+	var col0: int = MARGIN
+	var col1: int = MARGIN + COL_W + COL_GAP
+	var col2: int = MARGIN + (COL_W + COL_GAP) * 2
+	var y: int = HEADER_H + MARGIN
+
+	_draw_specialist_panel(Vector2i(col0, y))
+	_draw_gpp_panel(Vector2i(col1, y))
+	_draw_gw_panel(Vector2i(col2, y))
+
+	var by: float = float(H) - 40.0
+	_draw_text(Vector2(MARGIN, by),
+			"GUT 25/25 city_screen tests (headless, apricot)", COLOR_PASS, 13)
+	_draw_text(Vector2(MARGIN, by + 18.0),
+			"Authored: 7 specialist classes · 30 great works · 12 new buildings · 4 harvest policies",
+			COLOR_DIM, 12)
+
+
+func _draw_title(text: String) -> void:
+	draw_string(_font, Vector2(MARGIN, 24), text,
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 14, COLOR_TEXT)
+
+
+func _draw_specialist_panel(origin: Vector2i) -> void:
+	var ph: int = H - HEADER_H - MARGIN * 3 - 60
+	var rect: Rect2 = Rect2(Vector2(origin.x, origin.y), Vector2(COL_W, ph))
+	draw_rect(rect, COLOR_PANEL, true)
+	draw_rect(Rect2(rect.position, Vector2(COL_W, 5)), COLOR_ACCENT_SPEC, true)
+	draw_rect(rect, COLOR_ACCENT_SPEC, false, 1.0)
+
+	var ty: float = rect.position.y + 22.0
+	draw_string(_font, Vector2(rect.position.x + 10, ty), "SPECIALIST SLOTS",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 14, COLOR_ACCENT_SPEC)
+	ty += 20.0
+	draw_string(_font, Vector2(rect.position.x + 10, ty),
+			"(GdBuildingCivics + GdSpecialistRegistry)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_DIM)
+	ty += 22.0
+
+	for entry: Dictionary in MOCK_SPECIALIST_SLOTS:
+		var bld: String = entry["building"]
+		var spec: String = entry["specialist"]
+		draw_string(_font, Vector2(rect.position.x + 12, ty),
+				bld, HORIZONTAL_ALIGNMENT_LEFT, COL_W - 22, 12, COLOR_TEXT)
+		ty += 15.0
+		draw_string(_font, Vector2(rect.position.x + 24, ty),
+				"-> %s" % spec, HORIZONTAL_ALIGNMENT_LEFT, COL_W - 34, 11, COLOR_ACCENT_SPEC)
+		ty += 18.0
+
+	ty += 8.0
+	draw_string(_font, Vector2(rect.position.x + 10, ty),
+			"Total: %d slot assignments" % MOCK_SPECIALIST_SLOTS.size(),
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 12, COLOR_PASS)
+
+
+func _draw_gpp_panel(origin: Vector2i) -> void:
+	var ph: int = H - HEADER_H - MARGIN * 3 - 60
+	var rect: Rect2 = Rect2(Vector2(origin.x, origin.y), Vector2(COL_W, ph))
+	draw_rect(rect, COLOR_PANEL, true)
+	draw_rect(Rect2(rect.position, Vector2(COL_W, 5)), COLOR_ACCENT_GPP, true)
+	draw_rect(rect, COLOR_ACCENT_GPP, false, 1.0)
+
+	var ty: float = rect.position.y + 22.0
+	draw_string(_font, Vector2(rect.position.x + 10, ty), "GPP / TURN (7 CHANNELS)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 14, COLOR_ACCENT_GPP)
+	ty += 20.0
+	draw_string(_font, Vector2(rect.position.x + 10, ty),
+			"(GppAccumulator · Civ5 doubling threshold)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_DIM)
+	ty += 24.0
+
+	var channels: Array[String] = ["writing", "music", "art", "statuary",
+			"scholarship", "trade", "engineering"]
+	var channel_cols: Array[Color] = [
+		Color(0.75, 0.90, 0.75), Color(0.75, 0.80, 0.95), Color(0.95, 0.75, 0.75),
+		Color(0.85, 0.85, 0.70), COLOR_ACCENT_GPP, Color(0.90, 0.80, 0.60),
+		Color(0.70, 0.85, 0.90),
+	]
+
+	var total_gpp: int = 0
+	for i: int in range(channels.size()):
+		var channel: String = channels[i]
+		var val: int = MOCK_GPP.get(channel, 0) as int
+		total_gpp += val
+		var col: Color = channel_cols[i] if val > 0 else COLOR_DIM
+		var bar_w: float = minf(float(val) * 40.0, float(COL_W) - 100.0)
+		if bar_w > 0.0:
+			draw_rect(Rect2(Vector2(rect.position.x + 90.0, ty - 12.0),
+					Vector2(bar_w, 14.0)), col * Color(1, 1, 1, 0.25), true)
+		draw_string(_font, Vector2(rect.position.x + 12.0, ty),
+				"%s:" % channel.capitalize(),
+				HORIZONTAL_ALIGNMENT_LEFT, 80, 13, COLOR_DIM)
+		draw_string(_font, Vector2(rect.position.x + 92.0, ty),
+				"+%d/turn" % val,
+				HORIZONTAL_ALIGNMENT_LEFT, -1, 13, col)
+		ty += 22.0
+
+	ty += 8.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"Total: %d GPP/turn" % total_gpp, HORIZONTAL_ALIGNMENT_LEFT, -1, 12, COLOR_PASS)
+	ty += 16.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"8/8 GppAccumulator tests green",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_PASS)
+
+
+func _draw_gw_panel(origin: Vector2i) -> void:
+	var ph: int = H - HEADER_H - MARGIN * 3 - 60
+	var rect: Rect2 = Rect2(Vector2(origin.x, origin.y), Vector2(COL_W, ph))
+	draw_rect(rect, COLOR_PANEL, true)
+	draw_rect(Rect2(rect.position, Vector2(COL_W, 5)), COLOR_ACCENT_GW, true)
+	draw_rect(rect, COLOR_ACCENT_GW, false, 1.0)
+
+	var ty: float = rect.position.y + 22.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty), "GREAT-WORK SLOT CAPACITY",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 14, COLOR_ACCENT_GW)
+	ty += 20.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"(GreatWorkRegistry · 30 works authored)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_DIM)
+	ty += 28.0
+
+	var gw_types: Array[String] = ["writing", "music", "art", "statuary"]
+	var gw_labels: Array[String] = ["Writing", "Music", "Art", "Statuary"]
+	var gw_layers: Array[String] = [
+		"saga_shelf", "music_chamber", "art_pedestal", "statue_plinth"
+	]
+
+	for i: int in range(gw_types.size()):
+		var t: String = gw_types[i]
+		var cap: int = MOCK_GW_SLOTS.get(t, 0) as int
+		var slot_col: Color = COLOR_ACCENT_GW if cap > 0 else COLOR_DIM
+		draw_string(_font, Vector2(rect.position.x + 12.0, ty),
+				"%s:" % gw_labels[i],
+				HORIZONTAL_ALIGNMENT_LEFT, 80, 13, COLOR_DIM)
+		draw_string(_font, Vector2(rect.position.x + 92.0, ty),
+				"0 / %d slots" % cap,
+				HORIZONTAL_ALIGNMENT_LEFT, -1, 13, slot_col)
+		ty += 17.0
+		draw_string(_font, Vector2(rect.position.x + 24.0, ty),
+				"-> Throne room: %s" % gw_layers[i],
+				HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_DIM)
+		ty += 22.0
+
+	ty += 12.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"30 authored works (8W + 6M + 8A + 8S)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 12, COLOR_PASS)
+	ty += 16.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"3/3 GreatWorkRegistry tests green",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_PASS)
+	ty += 16.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"5 national wonders (all-cities gate)",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_PASS)
+	ty += 16.0
+	draw_string(_font, Vector2(rect.position.x + 10.0, ty),
+			"HarvestPolicyRegistry: 4 policies loaded",
+			HORIZONTAL_ALIGNMENT_LEFT, -1, 11, COLOR_PASS)
+
+
+func _draw_text(pos: Vector2, text: String, col: Color, size: int) -> void:
+	draw_string(_font, pos, text, HORIZONTAL_ALIGNMENT_LEFT, -1, size, col)
+
+
+func _capture_and_quit() -> void:
+	await get_tree().process_frame
+	await get_tree().process_frame
+	var img: Image = get_viewport().get_texture().get_image()
+	DirAccess.make_dir_recursive_absolute(OUTPUT_DIR)
+	var ts: String = Time.get_datetime_string_from_system().replace(":", "-")
+	var name: String = "proof_civics_buildings_%s.png" % ts
+	var path: String = "%s/%s" % [OUTPUT_DIR, name]
+	var err: Error = img.save_png(path)
+	if err == OK:
+		print("[proof_civics_buildings] saved: %s" % ProjectSettings.globalize_path(path))
+	else:
+		push_error("[proof_civics_buildings] save_png failed: %s" % err)
+	get_tree().quit()
diff --git a/src/game/engine/scenes/tests/proof_civics_buildings.tscn b/src/game/engine/scenes/tests/proof_civics_buildings.tscn
new file mode 100644
index 00000000..018749c7
--- /dev/null
+++ b/src/game/engine/scenes/tests/proof_civics_buildings.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://p1_56_civics_proof"]
+
+[ext_resource type="Script" path="res://engine/scenes/tests/proof_civics_buildings.gd" id="1_script"]
+
+[node name="ProofCivicsBuildings" type="Node2D"]
+script = ExtResource("1_script")