chore: add changeset entry

Author: damassi

.changesets/feat_pass_session_id.md

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+### feat: Pass `remote-mcp` mcp-session-id header along to GraphQL request - @damassi PR #236
+
+This adds support for passing the `mcp-session-id` header through from `remote-mcp` via the MCP client config. This header [originates from the underlying `@modelcontextprotocol/sdk` library](https://github.com/modelcontextprotocol/typescript-sdk/blob/a1608a6513d18eb965266286904760f830de96fe/src/client/streamableHttp.ts#L182), invoked from `remote-mcp`.
+
+With this change it is possible to correlate requests from MCP clients through to the final GraphQL server destination.