AZZLE XMTP schemas

• accept-delivery.json
• arbitrator-proposal.json
• capability-proof.json
• delivery-notice.json
• dispute-evidence.json
• envelope.json
• identity-link.json
• milestone-definition.json
• mutual-cancel.json
• payment-request.json
• replacement-context.json
• revision-request.json
• supervisor-veto.json
• task-acceptance.json
• task-counter-offer.json
• task-proposal.json