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* fix(mcp): JSON-RPC spec compliance — flexible id, correct notification format - McpRequest.id is now Option<u64> with skip_serializing_if, so notifications omit the id field as required by JSON-RPC 2.0 spec. Previously sent id: 0 which violates the spec. - McpResponse.id uses flexible deserialization that accepts number, string, or null — fixes interop with non-standard MCP servers that return string ids or missing id fields on error responses. Co-Authored-By: Claude Opus 4.6 <[email protected]> * Fix review feedback: remove serde(default) from McpResponse.id, fix test assertions - Remove #[serde(default)] from McpResponse.id so notifications (no id field) don't incorrectly parse as responses — prevents DoS/spoofing via SSE - Update test assertions to use Some(value) after id became Option<u64> Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: update new transport files for Option<u64> id after rebase Upstream #721 added stdio/unix/transport modules that use McpRequest.id and McpResponse.id as u64. After our rebase (which changes id to Option<u64>), these need .unwrap_or(0) for HashMap keys and Some() wrapping in tests. Co-Authored-By: Claude Opus 4.6 <[email protected]> * test: add regression tests for JSON-RPC spec compliance Tests for notification serialization without id field, flexible id deserialization (string, null, non-numeric). Co-Authored-By: Claude Opus 4.6 <[email protected]> --------- Co-authored-by: Claude Opus 4.6 <[email protected]>