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ci.yml / docs: add showcase example for server and A2A integration (push) Failing after 0s
Adds a complete end-to-end walkthrough of the server connection CLI commands and A2A protocol facade, verified by the UAT system with real command outputs. Covers: - agents server --help, connect, status, serve commands - All output formats (rich, json, yaml, plain) - A2A JSON-RPC 2.0 wire format (A2aRequest, A2aResponse, A2aEvent) - A2aLocalFacade: 42 supported operations, stub mode, service wiring - get_facade() wired to real DI container - A2aVersionNegotiator: version negotiation and mismatch handling - ServerConnectionConfig: validation rules Also updates examples.json index with the new entry.