Allow multiple guesses on the same game (w/ cooldown mech)

Since we've switched to the cooldown mechanic (1guess/12h) we should be able to guess on the same game if it's still going. If implemented this should only affect yellow/green guess counts and most guessed word. Win/lose games and par should not be affected by the additional guesses.

No files or tests are named. Start by locating the cooldown and guess-count handling, then trace how yellow/green counts, most-guessed word, wins, losses, and par are recorded. Done means a game can accept another guess after the cooldown without changing win/lose totals or par, while the specified guess statistics update correctly.

Written by the indexing model from the issue text.