feat(planning): make optimization rules composable

Evaluate explicit, ordered optimization configurations through one shared
planner model. Add six editable presets, durable one-time legacy migration,
and consistent completed and cancelled plan provenance.

Include functional regressions and the agreed trace-removal and benchmark
follow-up specs. Performance acceptance remains in #78 under unchanged gates.

Refs: #70, #71, #72, #73, #74, #75, #76, #77, #78

src/app/components/calendar-year/calendar-year.ts

@@ -1536,6 +1536,24 @@ export class CalendarYear {
 	}
 
 	protected objectiveCopy(id: string) {
+		if (id.startsWith('optimization:')) {
+			const ruleId = id.slice('optimization:'.length);
+			const rule = this.activeCalculation?.snapshot.rules.find(
+				(candidate) => candidate.id === ruleId,
+			);
+			const copy = this.tr().planning.explanation.objectives['optimization'];
+			return {
+				...copy,
+				label: copy.label
+					.replace('{rule}', this.ruleLabel(ruleId))
+					.replace(
+						'{summary}',
+						rule && 'configuration' in rule
+							? this.translationService.optimizationSummary(rule.configuration)
+							: '',
+					),
+			};
+		}
 		const key = id.startsWith('preference:') ? 'preference' : id;
 		const copy = this.tr().planning.explanation.objectives[key];
 		const rule =
@@ -1645,7 +1663,7 @@ export class CalendarYear {
 		if (stage === 'validation') return 5;
 		if (stage === 'obligations') return 20;
 		if (stage === 'at-risk') return 35;
-		if (stage.startsWith('preference:')) return 50;
+		if (stage.startsWith('preference:') || stage.startsWith('optimization:')) return 50;
 		if (stage === 'holiday-week-value') return 58;
 		if (stage === 'non-working-day-gain') return 65;
 		if (stage === 'longest-work-sequence') return 72;