test: add arg-parsing explicit-org-suffix URL path test

Add test for parseIssueArg with a Sentry URL containing a no-dash
issue ID (e.g., /issues/G/) — exercises the explicit-org-suffix path
in issueArgFromUrl (lines 445-453 of arg-parsing.ts).

Author: BYK

test/lib/arg-parsing.test.ts

@@ -543,6 +543,18 @@ describe("parseIssueArg", () => {
         baseUrl: "https://sentry.example.com",
       });
     });
+
+    test("issue URL with no-dash short ID returns explicit-org-suffix", () => {
+      // URL with issue ID that has no dash — rare, but handled gracefully.
+      // issueArgFromUrl: issueId="G" (no digits, no dash) → explicit-org-suffix
+      expect(
+        parseIssueArg("https://sentry.io/organizations/my-org/issues/G/")
+      ).toEqual({
+        type: "explicit-org-suffix",
+        org: "my-org",
+        suffix: "G",
+      });
+    });
   });
 
   // Parser preserves DSN-style org identifiers (normalization moved to resolution layer)