fix: more nlreturn and testifylint issues

- Add blank lines before return statements
- Use require.Error instead of assert.Error for error assertions
- Keep exact float64 comparisons as-is (they are integers from JSON)

internal/cli/version_test.go

@@ -128,7 +128,7 @@ func TestListVersionsNonExistentSecret(t *testing.T) {
 
 	// Try to list versions of non-existent secret
 	err := cli.ListVersions(cmd, "nonexistent/secret")
-	assert.Error(t, err)
+	require.Error(t, err)
 	assert.Contains(t, err.Error(), "not found")
 }
 
@@ -212,7 +212,7 @@ func TestPromoteNonExistentVersion(t *testing.T) {
 
 	// Try to promote non-existent version
 	err = cli.PromoteVersion(cmd, "test/secret", "20991231.999")
-	assert.Error(t, err)
+	require.Error(t, err)
 	assert.Contains(t, err.Error(), "not found")
 }