RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/evaluator.py
- tests/test_func_002_parameters.py

SUMMARY:
Implemented definition-time lexical closures while preserving recursion, redefinition, arity, and generator behavior.

Verification:
- 120 pytest tests passed.
- Conformance `def ` slice: 15 passed, 0 failed, 0 errored, 2 skipped.

BLOCKERS:
- None