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Improve validation error messages with developer hints

Improve validation error messages with developer hints: a task in LegoFlow-SWE (Harbor dataset). When validate or validateGraph detect a problem, the returned raw Zod errors are difficult to interpret. Developers need actionable, human-readable messages that clearly identify the component, the…

The task

When `validate` or `validateGraph` detect a problem, the returned raw Zod errors are difficult to interpret. Developers need actionable, human-readable messages that clearly identify the component, the offending prop, and what the expected values are.

Part of Lego-X/LegoFlow-SWE.