docs: add troubleshooting and migration guidance for Zod schema shape differences - #2870

{ "workflowData": { "owner": "modelcontextprotocol", "repo": "typescript-sdk", "sha": "48734f60058b5b26ea859e1a0e7f04bba483f909", "ref": "2870", "headBranch": null }, "key": "LGxDtFFanO", "runId": 36108071679, "webhookDebug": { "action": "requested", "head_branch": "fix/docs-zod-schema-troubleshooting", "head_repository_full_name": "diveshs0801/typescript-sdk", "full_name": "modelcontextprotocol/typescript-sdk", "isPullRequest": true, "prNumber": 2870, "prNumberType": "number", "isNewPullRequest": true, "isOldPullRequest": false, "prKey": "diveshs0801/typescript-sdk:fix/docs-zod-schema-troubleshooting", "oldPrDataHash": "jtMRpFRUjv", "lookupKey": "diveshs0801/typescript-sdk:fix/docs-zod-schema-troubleshooting", "data": { "owner": "modelcontextprotocol", "repo": "typescript-sdk", "sha": "48734f60058b5b26ea859e1a0e7f04bba483f909", "ref": "2870", "headBranch": null } }, "currentCursor": null, "pkgPrNewVersion": "0.0.88" }