Carlos Escalante 0a4c3e9436 Validate month input and document cycle labeling convention ...

Review finding BE-06 (suspected off-by-one in get_cycle_range) is a
FALSE POSITIVE: budget month M composes get_previous_cycle with
get_cycle_range to cover [(M-1)/18, M/18), matching both the code
comment and the frontend convention. Verified against prod data: May
2026 cycle-window SQL sum matches the API (95 txs exactly, refunds to
the colón, 0.13%% delta from one EUR tx). The docstring now spells out
the labeling convention, and month is validated 1-12 (BE-07).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-06-09 19:46:54 -06:00

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