RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/evaluator.py
- tests/test_path_002_access_mutation.py

SUMMARY:
Implemented deletion and assignment semantics, including immutable updates, multi-path handling, RHS generator behavior, and empty-update deletion.

Verification: 77/77 scoped conformance cases passed; 10 path mutation tests passed.

BLOCKERS:
- None