Make a ledger's failing test suite pass by migrating money from float to Decimal consistently (parsing…

Make a ledger's failing test suite pass by migrating money from float to Decimal consistently (parsing…: a task in agent-harbor-tasks (Harbor dataset). We agreed (see the ADR in docs/) to stop using floats for money in ledgerly. The tests describing the target behaviour are already in tests/ , but…

The task

We agreed (see the ADR in docs/) to stop using floats for money in ledgerly. The tests describing the target behaviour are already in `tests/`, but nobody did the migration yet, so the suite is red.

Part of efederici/agent-harbor-tasks.