Jakarta Bean Validation for mocapi handlers. Bundles Hibernate-backed Validator (spring-boot-starter-validation), methodical's JakartaMethodValidatorFactory, and ripcurl's ConstraintViolationException-to-JSON-RPC translator. Adding this module to the classpath lets users annotate @McpTool / @McpPrompt / @McpResourceTemplate parameters with @NotBlank/@Size/@Pattern/etc.; violations in prompt and resource handlers surface as JSON-RPC -32602 Invalid params with per-violation detail in the ...