style(tsconvert): enforce two-space indentation for TypeScript interfaces

- Add two spaces before each field in generated interfaces
- Use newlines between fields and closing brace for proper formatting
- Update test to validate proper indentation
- Document test requirements in AGENTS.md

internal/tsconvert/convert.go

@@ -155,14 +155,14 @@ func collectStructTypes(t reflect.Type, ts *TypeSet) {
 			fieldName += "?"
 		}
 
-		fields = append(fields, fmt.Sprintf("%s: %s", fieldName, tsType))
+		fields = append(fields, fmt.Sprintf("  %s: %s", fieldName, tsType))
 
 		// Recursively Collect Nested Types
 		collectType(field.Type, ts)
 	}
 
 	// Add Type Definition
-	definition := fmt.Sprintf("interface %s {%s}", name, strings.Join(fields, "; "))
+	definition := fmt.Sprintf("interface %s {\n%s\n}", name, strings.Join(fields, "\n"))
 	_ = ts.Add(name, definition)
 }