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/benchmark/leave-planner-benchmark.spec.ts

@@ -41,10 +41,11 @@ describe('leave planner benchmark protocol', () => {
 					String(rttRule.startDate) <= String(cpRule.endDate),
 			).toBe(true);
 		const chain = scenarios.find((scenario) => scenario.name === 'chained earned entitlements');
-		expect(chain?.request.rules?.map((rule) => rule.id)).toEqual([
-			'wednesday-holidays',
-			'thursday-consumer',
-		]);
+		expect(
+			chain?.request.rules
+				?.filter(({ type }) => type !== 'optimization')
+				.map((rule) => rule.id),
+		).toEqual(['wednesday-holidays', 'thursday-consumer']);
 
 		const browserWindow = globalThis.window;
 		vi.stubGlobal('window', undefined);