Refactor sud JSON pot params under a nested 'pot' key

Top-level pot_mass/pot_material/L/Td/grain_mass/water_mass and their
per-step overrides are now grouped under a 'pot' sub-object, matching
the structure already applied to sud_0010.json's parent level. Updated
all sude/*.json files and the parsing/consuming code in components/sud.py,
tasks/sud.py, components/sud_forecast.py, and scripts/demos/sud/demo_sud.py.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T52JH848ojhXXHn1bAzdC3

tasks/sud.py

@@ -164,7 +164,8 @@ class SudTask(ATask):
 		phase = ramp if ramping else hold
 
 		if step is not None:
-			self.apply_plant_params(step.get('grain_mass', 0), step.get('water_mass', 0))
+			pot = step.get('pot', {})
+			self.apply_plant_params(pot.get('grain_mass', 0), pot.get('water_mass', 0))
 			if ramping and step['temperature'] is not None:
 				self.tc.set_theta_soll(step['temperature'])
 				self.tc.set_heatrate_soll(ramp['rate'])
@@ -383,12 +384,14 @@ class SudTask(ATask):
 		doc = {
 			'Name': self.sud.name,
 			'Description': self.sud.description,
-			'pot_mass': self.sud.pot_mass,
-			'pot_material': self.sud.pot_material,
-			'L': self.sud.L,
-			'Td': self.sud.Td,
-			'grain_mass': self.sud.grain_mass,
-			'water_mass': self.sud.water_mass,
+			'pot': {
+				'mass': self.sud.pot_mass,
+				'material': self.sud.pot_material,
+				'L': self.sud.L,
+				'Td': self.sud.Td,
+				'grain_mass': self.sud.grain_mass,
+				'water_mass': self.sud.water_mass,
+			},
 			'steps': schedule[index:],
 		}
 		start_theta = self.tc.get_theta_ist()