Review end-to-end test coverage for this feature group.

For every feature listed:
- Verify an e2e test exists with ZERO mocks — real dependencies only.
- Tests must cover all boundary conditions: maximum file sizes, maximum input lengths, empty inputs, extremely large inputs.
- If a value can be infinite or unbounded, there must be a test case for that.
- Every boundary, limit, and edge of the input domain must be exercised.

If tests are missing or incomplete, write them.
Score 0–100 based on boundary-condition coverage AFTER your fixes.
