fix(e2e): non-mutating reverse in CleanupRegistry

Array.reverse mutates in place — a defensive double-run() would have
re-reversed the items. Iterate over a copy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dashboard/tests/e2e/fixtures/cleanup.ts

@@ -32,7 +32,10 @@ export class CleanupRegistry {
 		if (this.items.length === 0) return;
 		const api = await adminApi();
 		try {
-			for (const item of this.items.reverse()) {
+			// Copy-then-reverse so a defensive double-`run()` (or a
+			// caller that inspects the registry after a partial
+			// teardown) doesn't see the items in a re-reversed order.
+			for (const item of [...this.items].reverse()) {
 				try {
 					await item(api);
 				} catch {