The reset-aware level gate in BotPartyHandler rejected nearly every party
invitation on servers with resets, because it folded reset count into the level
scale (one reset ~= 400 points against a 500 cap). A veteran player inviting a
freshly generated bot was always over the limit, so the invitation was silently
declined. Remove the gate so a bot accepts any inviter who is alive and in the
world, matching OpenMU's own party action; the situational safeguards (shopping,
revenge, mini game, pending invite, human companion) stay in place.
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