ConstType-only helper that assigns action output values in the action body, enabling datapill references to step results.
Rules
• _outputs is the output schema from params.outputs in the action body.
• _values keys are constrained to the declared output names — arbitrary
keys produce a TypeScript error and Ctrl+Space shows valid output names.
• Each value must be assignable to the corresponding output type (string
values are permitted for template expressions / datapills).
This helper is erased at runtime – it only influences the TypeScript type-checker.
Assign action output values in the body, enabling datapill references to step results.