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/mvp/test_pending_service_pricing_report.gd

@@ -1,5 +1,8 @@
 extends SceneTree
 
+const FixtureCleanup := preload("res://tests/helpers/ui_audio_fixture_cleanup.gd")
+var _finishing := false
+
 ## Uses the real Main business controls and Runtime paid-service boundary.
 ## No amount, deficit threshold or production attribute assignment is introduced.
 var _checks := 0
@@ -211,7 +214,13 @@ func _expect(ok: bool, label: String) -> void:
 
 
 func _finish() -> void:
+	if _finishing:
+		return
+	_finishing = true
 	if is_instance_valid(_main):
-		_main.queue_free()
+		var final_cleanup: Dictionary = await FixtureCleanup.free_owner_and_wait(self, _main)
+		if not bool(final_cleanup.get(&"passed", false)):
+			_failures += 1
+			push_error("ordinary Main pricing fixture audio cleanup failed")
 	print("Pending service pricing report: %d checks, %d failures" % [_checks, _failures])
 	quit(1 if _failures > 0 else 0)