Discard predictions only when their inputs change

A finished plan was discarded whenever any watched State object changed
during the save or calculation, including diagnostic-only weather
sensors and the thermostat's current_temperature/hvac_action. The
proposed-heat entity then went unavailable for five minutes without
cause. Compare only the values the prediction uses: room and outdoor
temperature states and units, thermostat mode and target, and relay
state and last change.

Also pass config_entry to the coordinator explicitly instead of relying
on HA's ContextVar fallback, which HA reports as deprecated usage.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_coordinator.py

@@ -388,6 +388,19 @@ class BoundaryTests(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(data['sample_result'], 'first_sample')
         self.assertGreater(data['heat_lag_uncertainty'], 0.4)
 
+    async def test_diagnostic_input_changes_do_not_discard_prediction(self):
+        self.ready()
+        self.c.config['outside_pressure_sources'] = ['sensor.pressure']
+        self.set_state('sensor.pressure', '1010', unit_of_measurement='hPa')
+        self.set_state('climate.reference', 'heat', temperature=22, current_temperature=20.0)
+        async def changed(job):
+            output = job()
+            self.set_state('sensor.pressure', '1011', unit_of_measurement='hPa')
+            self.set_state('climate.reference', 'heat', temperature=22, current_temperature=20.1)
+            return output
+        self.hass.async_add_executor_job = changed
+        self.assertEqual((await self.sample())['status'], 'ready')
+
     async def test_heat_gain_identified_with_mid_interval_switching(self):
         """Synthetic plant with radiator lag, cycled by a hysteresis thermostat."""
         a, b, c = 0.004, 0.12, 0.0005