test(benchmark): print a readable summary table

Print the calibration and a Markdown table with one aligned row per
scenario as soon as it finishes: both planning times, mean, budget, ratio,
multiplier, outcome, placements, determinism and budget status. Write
directly to stdout so Vitest adds no per-line headers. The complete TSV
report still follows the table.

Refs #281, #285

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

src/app/benchmark/benchmark-budget.spec.ts

@@ -1,4 +1,9 @@
-import { BenchmarkMeasurement, budgetViolations } from './leave-planner-benchmark';
+import {
+	BenchmarkMeasurement,
+	benchmarkSummaryHeader,
+	benchmarkSummaryRow,
+	budgetViolations,
+} from './leave-planner-benchmark';
 
 const measure = (scenario: string, planningMs: number) =>
 	({ scenario, planningMs }) as BenchmarkMeasurement;
@@ -28,3 +33,31 @@ describe('benchmark budget gate', () => {
 		]);
 	});
 });
+
+describe('benchmark summary table', () => {
+	const runs = (planningMs: number[]) =>
+		planningMs.map(
+			(ms, index) =>
+				({
+					scenario: 'a',
+					planningMs: ms,
+					outcome: 'Plan',
+					lastCompletedStage: 'dates',
+					placements: 3,
+					deterministic: index ? 'yes' : 'baseline',
+				}) as BenchmarkMeasurement,
+		);
+	it('aligns rows with the header', () => {
+		const [header, separator] = benchmarkSummaryHeader().split('\n');
+		const row = benchmarkSummaryRow(runs([150, 250]), 100, { a: 2 });
+		expect(row).toHaveLength(header.length);
+		expect(separator).toHaveLength(header.length);
+		expect(row).toContain('0.15 / 0.25 s');
+		expect(row).toContain('Plan (dates)');
+		expect(row).toMatch(/\| ok +\|$/);
+	});
+	it('marks scenarios over budget or without a budget', () => {
+		expect(benchmarkSummaryRow(runs([300, 320]), 100, { a: 2 })).toMatch(/\| OVER +\|$/);
+		expect(benchmarkSummaryRow(runs([1]), 100, {})).toMatch(/\| no budget \|$/);
+	});
+});