test(@projects/@magic-civilization): 🐛 update stale fog tests (vellum texture + non-gated resource)

- test_fog_renderer: unexplored tiles render the procedural dwarven-vellum
  texture with a white modulate (commit 30bcde26d); UNEXPLORED_COLOR is only the
  flat fallback. Assert the texture is applied + white verts, not flat colour.
- test_fog_of_war: is_resource_visible_to used iron_ore, which is
  visibility:tech_gated (yield_gate "bronze_working") — so it also needs the
  tech + a GameState player. Use deer (non-gated) to isolate the visibility gate
  the test actually targets.

GUT: fog cluster cleared (716 passing / 11 failing).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/game/engine/tests/integration/test_fog_renderer_consumes_vision.gd

@@ -137,12 +137,16 @@ func test_unseen_tiles_polygon_is_visible_and_unexplored_color() -> void:
 	assert_not_null(node, "missing fog polygon for UNSEEN tile %s" % str(unseen_pos))
 	assert_true(node.visible,
 		"VIS_UNSEEN tile %s must have fog polygon visible" % str(unseen_pos))
+	# Unexplored tiles render the procedural dwarven-vellum texture with a white
+	# modulate so the texture's own tones show (commit 0cfd60124).
+	# UNEXPLORED_COLOR is only the flat fallback when texture generation fails.
+	assert_not_null(node.texture, "interior UNSEEN tile must paint the vellum fog texture")
 	var colors: PackedColorArray = node.vertex_colors
 	assert_eq(colors.size(), 6, "fog polygon must have 6 vertex colors")
 	for i: int in 6:
 		var c: Color = colors[i]
-		assert_eq(c, FogRendererScript.UNEXPLORED_COLOR,
-			"interior UNSEEN tile vertex %d must be UNEXPLORED_COLOR (no neighbor softening)" % i)
+		assert_eq(c, Color(1, 1, 1, 1),
+			"textured UNSEEN vertex %d uses white modulate (texture supplies the colour)" % i)
 
 
 # ---------------------------------------------------------------------------

src/game/engine/tests/unit/test_fog_of_war_vision.gd

@@ -146,9 +146,11 @@ func test_vision_memory_layer_persists() -> void:
 
 func test_resource_visible_to_requires_seen_tile() -> void:
 	## is_resource_visible_to must return false for VIS_UNSEEN tiles,
-	## true for VIS_SEEN_STALE and VIS_VISIBLE (assuming no tech gate).
+	## true for VIS_SEEN_STALE and VIS_VISIBLE. Use a NON-tech-gated resource
+	## (deer) so this isolates the visibility gate; iron_ore is yield_gate=
+	## "bronze_working" (visibility: tech_gated) and would also require the tech.
 	var tile: Tile = TileScript.new()
-	tile.resource_id = "iron_ore"
+	tile.resource_id = "deer"
 	tile.biome_id = "plains"
 
 	# Unseen — should not be visible.