Expose JSON-RPC error codes, and URLElicitationRequired errors #655
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Expose the jsonrpc.Error type to allow access to underlying JSON-RPC error codes. Also, expose common JSON-RPC error codes in the jsonrpc package, and MCP error codes in the mcp package. + tests Fixes modelcontextprotocol#452
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This change implements support for the MCP URL elicitation required error (-32042), enabling servers to request out-of-band user authorization and clients to automatically handle these requests with retry logic. Server-side: - Add CodeURLElicitationRequired constant - Add URLElicitationRequiredError() constructor. Client-side: - Add urlElicitationMiddleware to intercept URLElicitationRequired errors and retry calls. - Update callElicitationCompleteHandler to signal waiting operations. - Fix capability advertisement to support both form and URL modes. Fixes modelcontextprotocol#623
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Two logical commits: (1) Expose structured JSON-RPC errors, and (2) use this to export URLElicitationRequired errors from SEP 1036.
Please see the individual commit messages for details.