Record original-alignment implementation and traceability checkpoint

Capture current source, content data, tests, asset licenses, and original-specification traceability. Original implementation remains incomplete. The accepted matching UI generation passed 154 suites and 12,253 checks, with eight rendered staff-contract screens reviewed. Latest native Windows and full-original acceptance remain outstanding.

tests/fixtures/pre_upkeep_runtime.gd

@@ -0,0 +1,24 @@
+extends RefCounted
+
+## Build a genuine pre-v10 fixture only when no upkeep ledger history exists.
+static func strip_empty_upkeep(data: Dictionary) -> void:
+	for entry: Dictionary in data[&"economy"][&"entries"]:
+		assert(String(entry.get(&"category", "")) not in ["MAINTENANCE_ACCRUAL", "MAINTENANCE_PAYMENT"])
+	data.erase(&"weather")
+	data.erase(&"facility_cleanliness")
+	data.erase(&"facility_upkeep")
+	data.erase(&"upkeep_settlement")
+	var accounts: Array = data[&"economy"][&"accounts"]
+	for index in range(accounts.size() - 1, -1, -1):
+		if String(accounts[index][&"account_id"]) in ["MAINTENANCE_EXPENSE", "MAINTENANCE_PAYABLE"]:
+			accounts.remove_at(index)
+
+static func migrated_accrual(minute: int) -> Dictionary:
+	var accrual := FacilityUpkeepAccrual.new()
+	accrual.start_at(minute)
+	return accrual.create_snapshot()
+
+static func migrated_weather(minute: int) -> Dictionary:
+	var weather = preload("res://scripts/environment/weather_timeline.gd").new()
+	weather.initialize(&"clear", minute)
+	return weather.create_snapshot()