Add non-empty validation to workflow intent field in interactive.go

[Copilot]

The huh.NewText() intent field in the interactive workflow builder lacked validation, accepting empty or trivially short input while the workflow name field already enforced non-empty input via Validate().

What's in place

• pkg/cli/validators.go — ValidateWorkflowIntent function rejecting empty/whitespace-only input ("workflow instructions cannot be empty") and inputs under 20 characters ("please provide at least 20 characters of instructions")
• pkg/cli/interactive.go — Intent field wired to the validator:

  huh.NewText().
      Title("Describe what this workflow should do:").
      Value(&b.Intent).
      Validate(ValidateWorkflowIntent),

• pkg/cli/validators_test.go — TestValidateWorkflowIntent and TestValidateWorkflowIntent_EdgeCases covering empty, whitespace-only, too-short, and valid inputs

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