Save The Tree implementation and acceptance work in progress

Preserve production code, regression fixtures, audio assets and provenance, test infrastructure, and the original-completion plan and progress ledger. Final game and Windows acceptance remain pending; excluded local artifacts and native experiments are not part of this snapshot.

tests/ui/test_guest_decision_log.gd

@@ -1,4 +1,5 @@
 extends SceneTree
+const FixtureCleanup := preload("res://tests/helpers/ui_audio_fixture_cleanup.gd")
 const Demo := preload("res://scripts/ui/pixel_tower_demo.gd")
 var checks := 0
 var failures := 0
@@ -12,7 +13,8 @@ func run() -> void:
 	var runtime: Variant = root.get_node("SimulationRuntime")
 	var clock: Variant = root.get_node("GameClock")
 	var state: Variant = root.get_node("GameState")
-	clock.reset(1,6,0);state.reset();runtime.initialize(clock,state,424242);clock.set_paused(true)
+	# Disposable Demo fixture funds exact Doran signing_cost 300; DEFAULT5000 and paid hire stay unchanged.
+	clock.reset(1,6,0);state.reset();state.resources[&"gold"] += 300;runtime.initialize(clock,state,424242);clock.set_paused(true)
 	runtime.configure_save_policy({&"enabled":false,&"daily_checkpoint_enabled":false})
 	var demo := Demo.new()
 	expect(await demo.prepare(runtime,clock,self),"prepare normal construction and autonomous visitors")
@@ -87,5 +89,10 @@ func run() -> void:
 		scroll.scroll_vertical = 250
 		await process_frame;await RenderingServer.frame_post_draw
 		expect(root.get_texture().get_image().save_png(OS.get_environment("THE_TREE_REJECTION_CAPTURE")) == OK, "capture scrolled rejection details")
-	main.queue_free();await process_frame
+	var _audio_cleanup_final: Dictionary = await FixtureCleanup.free_owner_and_wait(self, main)
+	if not bool(_audio_cleanup_final.get(&"passed", false)):
+		push_error("Ordinary fixture audio cleanup failed: %s" % str(_audio_cleanup_final))
+		quit(96)
+		return
+	await process_frame
 	print("Guest decision log: %d checks, %d failures" % [checks,failures]);quit(failures)