- Convert `param: T | undefined = undefined` to optional `param?: T`.
- Drop dead `= false` defaults on the required cache-provider options.
- Make `GraphqlPaginatedContent.nodes/edges` optional so the `= []`
fallbacks (load-bearing for partial GraphQL connections) are valid.
- Type the unchecked `default_branch` response field as optional so
the `'HEAD'` fallback is retained.
- Drop `tag = undefined` from the Forgejo/Gitea/GitLab preset configs.
Part of #43845
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>