RCO-A2A MCP - streamable HTTP JSON-RPC at POST /mcp

resolve_compliance - current signed RCO for product x jurisdiction
get_record        - any RCO by record id, including superseded history
list_rule_sets    - versioned jurisdiction rule sets
list_issuers      - signed issuer registry
publish_record    - controlled issuer write path (partner rail, subscription key)

Human explanation: https://rco-a2a.ai/
Tool contract: https://rco-a2a.ai/schema/v1.4/resolve_compliance.tool.json
MCP Registry: io.github.greencore-solutions/rco-a2a