Ships parallel grid-search optimization, HTML reports, and the O(1) data
window that landed since 0.1.1.
Also tracks the sample EURUSD hourly CSV. The examples and the README's
157x benchmark all read data/EURUSD_1H.csv, which was gitignored, so none
of them ran on a fresh clone. `data/` becomes `data/*` plus a negation
because git cannot re-include a file whose parent directory is excluded.
