# Conditional Enum Implementation Progress

## Task Overview
Implement a new `conditional_enum` constraint called `enumif` that allows parameter values to be constrained based on the values of other parameters.

## Requirements
- Parameter can have `enumif` constraint: `{ "param": { "enumif": { "conditional_param": { "value1": ["option1", "option2"], "value2": ["option3"] } } } }`
- When conditional_param has value1, param can only be option1 or option2
- When multiple conditional parameters, use alphabetical order
- Conditional parameter must exist in query definition
- Cannot reference itself

## Current Progress
- [x] Analyzed existing constraint system in parameter_constraints.rs
- [x] Understood parameter validation flow in runner.rs
- [x] Add enumif field to ParameterConstraints struct
- [x] Implement parsing logic for enumif constraint in parse_constraints function
- [x] Modify validate method signature to accept all parameters for cross-parameter validation
- [x] Implement conditional validation logic (secure - fails if no conditions match)
- [x] Update all calling sites to pass parameter context
- [x] Add comprehensive tests
- [x] Test edge cases (multiple conditions, missing conditional param)
- [x] Run full test suite and fix any issues

## Summary
The `conditional_enum` constraint (`enumif`) has been successfully implemented with all features working correctly:

- Security-first approach: fails validation if no matching conditions found
- Alphabetical ordering for multiple conditional parameters
- Comprehensive parsing and validation logic
- Full test coverage including edge cases and malformed definitions
- All existing functionality preserved
