docs: add TSDocs for "Implement support for cross-module joins (#15979)"

[shahednasser]

Automated TSDoc Additions

This PR adds TSDoc comments to TypeScript source files changed in commit 643d903.

Triggered by: feat: Implement support for cross-module joins (#15979)

Files updated:

• packages/core/types/src/joiner/index.ts
• packages/core/types/src/modules-sdk/__fixtures__/remote-query-filters.ts
• packages/core/types/src/modules-sdk/to-remote-query.ts

Review carefully before merging. Claude may have missed context or used incorrect descriptions.

[changeset-bot]

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