Overview

Use and benchmark xxHash into the h computation on both the set (primary) and verify (non-primary) paths.

Scope of Work

• Plumb the algorithm selection into the code that sets h on the primary and
  recomputes it on non-primaries.
• Ensure both paths always use the same algorithm for a given entry.

Acceptance Criteria

• h is computed with xxHash on both paths (primary and non-primary) and validation round-trips with no false positives.