fix(ui-merge): K4 — the self-repo URL sweep keeps no population floor once the extension's last links left

Merging main brought #27275, which deleted the vscode-extension package and
with it the last two self-repo GitHub URLs in the tree, so the floor of 1
read 0. The extractor stays covered by its own selfRepoPath unit test.

Claude-Session: https://claude.ai/code/session_01L9qibyMpJZ67jrDrno4jY1
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

ui/scripts/__tests__/check-doc-links.test.ts

@@ -668,9 +668,12 @@ describe('the repo it guards', () => {
     }
 
     // 25 until objectstack#27145: the SDK pages that carried most of them left
-    // this workspace, and the monorepo copies link the docs site instead. Two
-    // when re-measured, so the floor only keeps the loop from going vacuous.
-    expect(targets.size).toBeGreaterThanOrEqual(1);
+    // this workspace, and the monorepo copies link the docs site instead. The
+    // last two went with the vscode-extension package (#27275), so the tree
+    // holds none today and there is no population floor to keep. What stops
+    // this from passing over a broken extractor is the `selfRepoPath` unit
+    // test further down, which feeds it the URL shapes directly; this case
+    // keeps the gate for the next self-repo URL someone writes.
     expect([...targets].filter((target) => !fs.existsSync(path.join(repoRoot, target)))).toEqual([]);
   });