Run migration memory tests after the main suite (Refs #102)

vite.config.ts

@@ -1,10 +1,31 @@
 import { sveltekit } from '@sveltejs/kit/vite';
-import { defineConfig } from 'vitest/config';
+import { configDefaults, defineConfig } from 'vitest/config';
+
+const migrationMemoryTest = 'tests/unit/migration-memory.test.ts';
 
 export default defineConfig({
     plugins: [sveltekit()],
     test: {
-        include: ['tests/**/*.{test,spec}.{js,ts}']
+        projects: [
+            {
+                extends: true,
+                test: {
+                    name: 'application',
+                    include: ['tests/**/*.{test,spec}.{js,ts}'],
+                    exclude: [...configDefaults.exclude, migrationMemoryTest],
+                    sequence: { groupOrder: 0 }
+                }
+            },
+            {
+                extends: true,
+                test: {
+                    name: 'migration-memory',
+                    include: [migrationMemoryTest],
+                    // The 256 MiB rebuild must not contend for disk I/O with other tests.
+                    sequence: { groupOrder: 1 }
+                }
+            }
+        ]
     },
     server: {
         port: 3000