Add an A2A JSON-RPC endpoint with authenticated message/send, message/stream, tasks/get, and tasks/cancel handling. Expose anonymous minimal Agent Cards while keeping the enabled-agent skills list behind existing Bearer authentication.
Bridge inbound calls into the existing agent runtime, add an in-memory task store with duplicate task rejection, JSON-RPC idempotency snapshots, terminal TTL cleanup, and SSE status/artifact event streaming with heartbeat comments.
Add the call_a2a_agent tool and peer adapter with Agent Card discovery fallback, blocking task polling through tasks/get, event-boundary SSE parsing, response caps, timeout limits, redirect refusal, and private-network SSRF protection.
Wire mateclaw.a2a configuration, document deployment settings in English and Chinese, mirror bundled docs, and cover task storage, JSON-RPC validation, card privacy, lifecycle/cancel behavior, SSE parsing, and outbound guardrails with focused tests.
