RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/evaluator.py
- tests/test_flow_005_reductions_iteration.py

SUMMARY:
Implemented projection-aware `first` path handling for `pick`, with reduction/iteration regression coverage.

Verification:
- FLOW-005 conformance: 52 passed, 0 failed, 0 errored
- Pytest: 101 passed

BLOCKERS:
- None