Build a small

Self-contained tool from an empty tree: it reads a file of append-only record entries, checks that each entry's hash links correctly to the one before it, reports the first break clearly, and exits non-zero on any inconsistency.

Probe whether the manifest fix is deployed

Cancelled immediately.

Make the hook count swaps.

Implement the hook so it charges a fixed swap fee in basis points, taken from the input currency on every swap in both directions, and accrued to the hook rather than to the pool.