v0.1.0

Added

• zod schemas for invites, drafts, terms, deadlines, reminders, history, reminder prefs and blocks, all .extend()-able. INVITE_KINDS, INVITE_STATES, HISTORY_ACTIONS.
• createInvite, transition, allowedActions, isOpen, isExpired, effectiveState: the state machine over pending, countered, accepted, declined, withdrawn, cancelled and expired.
• checkTerms, diffTerms.
• checkBlocks, checkCooldown, checkRateLimit, canSend: send rules.
• canRemind: reminders for accepted invites per the agreed plan and the recipient's prefs.
• inbox: needs my answer, waiting on them, active, past.