feat(codegen): re-export FetchAdapter from ORM barrel

[pyramation]

Summary

Split from #1200 (Issue 2 only).

Adds FetchAdapter to the barrel re-export from ./client in the generated index.ts, so it's importable via @scope/sdk/orm without needing a separate /client subpath.

Context: FetchAdapter is the default GraphQLAdapter implementation that wraps createFetch() from @constructive-io/fetch. It's already present in every generated client.ts. This change only affects the barrel export — making it accessible from the top-level ORM import.

Note from investigation: This may not be necessary — end users don't typically construct FetchAdapter directly. The OrmClientConfig already exposes endpoint, fetch, and adapter options that handle all use cases (including test mocking). Consider whether this export surface is actually needed.

Files changed:

• graphql/codegen/src/core/codegen/orm/client-generator.ts — added FetchAdapter to barrel export AST
• graphql/codegen/src/__tests__/codegen/__snapshots__/client-generator.test.ts.snap — updated 2 snapshots

Review & Testing Checklist for Human

• Decide if FetchAdapter should be part of the public SDK API surface, or if it should remain an internal implementation detail
• Run cd graphql/codegen && pnpm test to confirm all tests pass

Notes

This is Issue 2 from the original PR #1200. Issue 1 (BulkUploadFileInput types) is in a separate PR. Dan flagged that this export may be unnecessary since @constructive-io/fetch already exists and FetchAdapter is an internal default.

Link to Devin session: https://app.devin.ai/sessions/11c358ec8678488eba3255c53f3e440f
Requested by: @pyramation

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