protocol

Shared contract for Closed-Circuit (SIH 2026, VITBSIH26-388).

• PROTOCOL.md — frozen field definitions, schemas, decide() signature, veto rules.
• vectors/ — canonical test vectors (all 7 must pass in both Python + C arbiter).
• CONTRIBUTING.md — branching, DoD, review rules.

Used as a git submodule in platform and edge.