forgetest: the air-assist offset calibration runs before the heater tools

A queue runs the catalog in registration order among tests with the
same prerequisites, and cooling.aa-offset-calibrate followed
cooling.flow-verify. A flow-verify trial heats the tube water (a no-flow
trial by 17 C on the bench) and the warm slug circulates past the
coolant sensors for minutes afterward; the calibration's stationary gate
passed 44 s after the trial on image 20260902144848 and the edges read
the wave as disagreement.

The calibration is registered first now, with the reason beside it, and
tests/test_cooling_order.py holds the order.

Catalog consequence: the cooling.* implementation hashes move (the suite
file changed).

forgetest/tests/test_cooling_order.py

@@ -0,0 +1,19 @@
+"""cooling.aa-offset-calibrate is registered before the heater tools, so
+a queue runs it first: a heater trial leaves a warm slug circulating past
+the coolant sensors for minutes, and the tool's edges read it as
+disagreement."""
+import unittest
+
+from forgetest import catalog
+
+
+class CoolingOrderTests(unittest.TestCase):
+    def test_aa_offset_precedes_flow_verify(self):
+        reg = catalog.load_suite()
+        tests = catalog.all_tests(reg)
+        order = catalog.order_by_requires(tests, [t.id for t in tests])
+        self.assertLess(order.index("cooling.aa-offset-calibrate"), order.index("cooling.flow-verify"))
+
+
+if __name__ == "__main__":
+    unittest.main()