For validation of generated code, we only have `validateModule` , we should support `validateSyntax` or similar which can validate standalone code

[pratik-fractl]

This is what we do for validating a code we generate. This requires we have module <something>.<name>

agent workflowCreator {
  instruction "${WORKFLOW_CREATOR_INSTRUCTION}",
  llm "sonnet_llm",
  validate agentlang/validateModule,
  retry AgentCraft/classifyRetry,
  responseSchema AgentCraft/Generated
}

We must support something like:

agent workflowCreator {
  instruction "${WORKFLOW_CREATOR_INSTRUCTION}",
  llm "sonnet_llm",
  validate agentlang/validateSyntax,
  retry AgentCraft/classifyRetry,
  responseSchema AgentCraft/Generated
}

So, if it generates just this:

workflow createHubspotContact {
    {hubspot/Contact {
        email createHubspotContact.email,
        first_name createHubspotContact.firstName,
        last_name createHubspotContact.lastName
    }} @as contact;

    {ContactSearchResult {
        contactFound true,
        existingContactId contact.id
    }}
}

The validator must work.