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Error (agent): I need to fix my test expectations — the test had incorrect sign conventions. Let me trace through what the correct signs should be for each line: `e3` has a debit-normal account with a debit of 700, so it should be +700, meaning L3 should be +700; `e1` is a liability account with a credit of 1000, giving -1000 for L1. The implementation is actually working correctly — the test failures were in my own test expectations, not the code itself. I need to fix the test data: L3 should be +700 instead of -700, and I'll adjust the expected difference_cents and open_candidates accordingly. Then I'll re-run the full test suite to verify everything passes.