narrow types

[nikgraf]

Closes #566

[Copilot]

Pull request overview

This PR adds type filtering to relation queries by extracting and applying target entity type IDs. This enables narrowing query results to only include relations to/from specific entity types, improving query precision and potentially performance.

• Extracts target type IDs from relation schemas and includes them in relation metadata
• Adds GraphQL filters to relation queries based on entity types (using toEntity.typeIds for relations and fromEntity.typeIds for backlinks)
• Refactors tuple type extraction into a reusable helper function

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/hypergraph/test/utils/relation-config-overrides.test.ts	Adds test data (Episode/Podcast schemas), helper function for stringifying type IDs, and tests verifying type ID filters are correctly applied to relations and backlinks
packages/hypergraph/src/utils/relation-query-helpers.ts	Implements buildRelationTypeIdsFilter to generate GraphQL filter syntax for entity type IDs and integrates it into the relation query builder
packages/hypergraph/src/utils/get-relation-type-ids.ts	Adds getRelationTupleType and getRelationTargetTypeIds helpers to extract type information from schema AST, and includes targetTypeIds in relation metadata throughout the extraction logic

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