feat(planning): explain and trace planning decisions

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

@@ -29,7 +29,13 @@ describe('leave planner benchmark protocol', () => {
 			expect(chained?.placements).toBeGreaterThanOrEqual(3);
 			expect(loaded?.outcome).toBe('Plan');
 			expect(loaded?.deterministic).toBe(true);
-			expect(benchmarkReport(measurements).split('\n')).toHaveLength(6);
+			expect(loaded?.planningMs).toBeGreaterThanOrEqual(0);
+			expect(loaded?.traceDeliveryMs).toBeGreaterThanOrEqual(0);
+			expect(loaded?.traceStatus).toBe('ready');
+			expect(loaded?.traceCandidates).toBeGreaterThan(0);
+			const report = benchmarkReport(measurements);
+			expect(report.split('\n')).toHaveLength(6);
+			expect(report).toContain('planning_ms\ttrace_delivery_ms');
 		} finally {
 			vi.stubGlobal('window', browserWindow);
 		}