Print each Sud step's number and description in the demo

Makes it easier to follow which schedule step is currently active
when watching the demo run.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CgR9tPaSzFkAwRAUyeaaCD

components/sud.py

@@ -32,11 +32,11 @@ def _merge_defaults(default, override):
 	return merged
 
 
-def _build_step(defaults, raw_step):
+def _build_step(number, defaults, raw_step):
 	"""Fills in a schedule step with default.step's values. A step is a
 	ramp or a hold depending on which of those keys it specifies; the other
 	is left out rather than synthesized from defaults."""
-	step = {}
+	step = {'number': number}
 	for key in ('descr', 'user_message', 'user_wait_for_continue'):
 		step[key] = raw_step.get(key, defaults.get(key))
 	for key in ('ramp', 'hold'):
@@ -55,7 +55,7 @@ class Sud(AttributeChange):
 		self.description = data.get('Description', '')
 
 		step_defaults = data.get('default', {}).get('step', {})
-		self.schedule = [_build_step(step_defaults, raw) for raw in data['steps']]
+		self.schedule = [_build_step(i + 1, step_defaults, raw) for i, raw in enumerate(data['steps'])]
 
 		self.pot_mass = data.get('pot_mass', 0)
 		self.pot_material = data.get('pot_material')