test: update verify-website-links CLI happy-path fixture for repointed probe

The CLI-level TestRunVerifyWebsiteLinksHappyPath built its fixture site
from the old development/ probe pages. Repoint it to reference/index.html
-> /reference/cli/ (matching the probe change) and drop the removed
index.md-drop page, so the cmd/mdsmith-release suite passes too.

Author: claude

cmd/mdsmith-release/main_test.go

@@ -298,17 +298,14 @@ func TestRunBuildWebsiteEndToEnd(t *testing.T) {
 // exercised end-to-end.
 func TestRunVerifyWebsiteLinksHappyPath(t *testing.T) {
 	root := t.TempDir()
-	mq := filepath.Join(root, "development", "merge-queue", "index.html")
-	aa := filepath.Join(root, "development", "architecture-audit", "index.html")
+	ref := filepath.Join(root, "reference", "index.html")
 	st := filepath.Join(root, "reference", "schema-types", "index.html")
 	rule := filepath.Join(root, "rules", "mds001", "index.html")
-	for _, dir := range []string{filepath.Dir(mq), filepath.Dir(aa), filepath.Dir(st), filepath.Dir(rule)} {
+	for _, dir := range []string{filepath.Dir(ref), filepath.Dir(st), filepath.Dir(rule)} {
 		require.NoError(t, os.MkdirAll(dir, 0o755))
 	}
-	require.NoError(t, os.WriteFile(mq,
-		[]byte(`<a href="/development/pr-fixup-workflow/">x</a>`), 0o644))
-	require.NoError(t, os.WriteFile(aa,
-		[]byte(`<a href="/development/architecture/">x</a>`), 0o644))
+	require.NoError(t, os.WriteFile(ref,
+		[]byte(`<a href="/reference/cli/">x</a>`), 0o644))
 	require.NoError(t, os.WriteFile(st,
 		[]byte(`<a href="/rules/mds020-required-structure/">x</a>`), 0o644))
 	require.NoError(t, os.WriteFile(rule,