Module payload 

LDP payload mode definitions and negotiation types.

LDP supports multiple payload modes for data exchange:

• Mode 0: Plain text
• Mode 1: Semantic frames (structured JSON)
• Mode 2: Embedding hints (future)
• Mode 3: Semantic graphs (future)

MVP implements Modes 0 and 1 only.

Structs

NegotiatedPayload

Result of payload mode negotiation between two delegates.

Enums

PayloadMode

Payload mode for LDP message exchange.

Functions

negotiate_payload_mode

Negotiate the best payload mode from two ordered preference lists.