Test Matrix

For each changed unit/function, provide this matrix before coding tests:

Categories

1. Success path: expected output and side effects.
2. Boundary values: min, max, empty, zero, one, large input.
3. Guard clauses: invalid type/shape/range; missing required values.
4. Failure paths: downstream failure, timeout, retries exhausted.
5. State transitions: create/update/delete/retry/idempotency.
6. Determinism: stable behavior across repeated runs.

Output format

## Test Matrix: <unit>