feat(twofactor): add HOTP-based two-factor authentication - #102
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AbdulmujibOladayo
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Sep 11, 2026
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HOTP implementation follows RFC 4226 correctly (dynamic truncation, 6-digit mod). Verify()'s forward-window check is a sensible way to tolerate counter drift between client/server. LGTM.
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Adds a
twofactorpackage implementing HOTP one-time codes (RFC 4226) for two-factor account verification, with a counter-window aware Verify helper.Closes #55