Seed each Day-Care cartridge comparison from its own title [no-card]

The six tests drew their cases from one generator shared by the file, so
a test's inputs depended on which tests the worker had run before it:
Chromium and WebKit, or a full run and a single test, compared different
cases, and a failure could not be replayed by running that test alone.

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

tests/reference-day-care.spec.ts

@@ -190,8 +190,15 @@ test.describe("Day-Care routines against the cartridge", () => {
     ...extra,
   });
 
-  // A small deterministic generator for the cases.
+  // A small deterministic generator for the cases, seeded by each test from
-  let seed = 0x5eed;
+  // its own title (FNV-1a): a test's cases are the same whichever tests ran
+  // before it in the worker, and in every browser.
+  let seed = 0;
+  test.beforeEach(({}, testInfo) => {
+    seed = 0x811c9dc5;
+    for (const character of testInfo.title)
+      seed = Math.imul(seed ^ character.charCodeAt(0), 0x01000193) >>> 0;
+  });
   const next = (limit = 256) => {
     seed = (Math.imul(seed, 1664525) + 1013904223) >>> 0;
     return (seed >>> 8) % limit;