test(catalog): name the suffix test for what it now accepts, and pin the -1024 cost

The review is right that `isDatedVariantId matches only <alias>-YYYYMMDD` stopped
being true once MMDD was accepted. Renamed, and the MMDD case it now covers is
asserted in it rather than only elsewhere.

Also pins the cost the review asked for: a four-digit suffix that is a valid
month and day is read as one, so `model-1024` folds into `model`. Suffixes
that cannot be a date -- 2048, 4096, 8192, 0000 -- stay separate, which is what
keeps most version and size suffixes safe.

Author: ntdatt812

tests/codex-catalog.test.ts

@@ -3683,14 +3683,31 @@ describe("Codex catalog routed normalization", () => {
     expect(droppedConfiguredIds).toEqual([]);
     expect(models.map(m => m.id)).toContain("deepseek-v4-pro-0813");
   });
-  test("isDatedVariantId matches only <alias>-YYYYMMDD", () => {
+  test("isDatedVariantId matches <alias>-YYYYMMDD and <alias>-MMDD, nothing else", () => {
     expect(isDatedVariantId("claude-haiku-4-5-20251001", "claude-haiku-4-5")).toBe(true);
+    expect(isDatedVariantId("deepseek-v4-pro-0813", "deepseek-v4-pro")).toBe(true);
     expect(isDatedVariantId("claude-haiku-4-5-2025", "claude-haiku-4-5")).toBe(false);
     expect(isDatedVariantId("claude-haiku-4-5-latest", "claude-haiku-4-5")).toBe(false);
     expect(isDatedVariantId("claude-haiku-4-5", "claude-haiku-4-5")).toBe(false);
     expect(isDatedVariantId("claude-haiku-4-5-20251001", "claude-haiku-4")).toBe(false);
   });
 
+  // A four-digit suffix that IS a valid month and day is read as one, even when the
+  // author meant something else. `-1024` is October 24th, so `model-1024` folds into
+  // `model` and the two are treated as the same model. Pinned as a known cost of
+  // accepting MMDD at all: nothing in an id says which reading was intended, and the
+  // alternative -- rejecting MMDD -- is the bug this fold exists to fix (#3024).
+  test("a four-digit suffix that reads as a date is folded, context size or not", () => {
+    expect(isDatedVariantId("model-1024", "model")).toBe(true);
+    expect(isDatedVariantId("model-0128", "model")).toBe(true);
+    // Values that cannot be a date stay separate models, which is what keeps most
+    // version and size suffixes safe.
+    expect(isDatedVariantId("model-2048", "model")).toBe(false);
+    expect(isDatedVariantId("model-4096", "model")).toBe(false);
+    expect(isDatedVariantId("model-8192", "model")).toBe(false);
+    expect(isDatedVariantId("model-0000", "model")).toBe(false);
+  });
+
   test("disabled providers are excluded from routed model gathering", async () => {
     const models = await gatherRoutedModels({
       port: 10100,