fix: support legacy and beta prerelease version formats

src/infra/update-channels.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { isBetaTag, isStableTag } from "./update-channels.js";
+
+describe("update-channels tag detection", () => {
+  it("recognizes both -beta and .beta formats", () => {
+    expect(isBetaTag("v2026.2.24-beta.1")).toBe(true);
+    expect(isBetaTag("v2026.2.24.beta.1")).toBe(true);
+  });
+
+  it("keeps legacy -x tags stable", () => {
+    expect(isBetaTag("v2026.2.24-1")).toBe(false);
+    expect(isStableTag("v2026.2.24-1")).toBe(true);
+  });
+
+  it("does not false-positive on non-beta words", () => {
+    expect(isBetaTag("v2026.2.24-alphabeta.1")).toBe(false);
+    expect(isStableTag("v2026.2.24")).toBe(true);
+  });
+});