Add entity id for relation and backlink

[nikgraf]

No description provided.

[Copilot]

Pull request overview

Adds support for filtering relation/backlink fields by the connected entity’s ID, extending the existing filter→GraphQL translation to map entityId onto toEntityId (relations) or fromEntityId (backlinks). Also updates docs, tests, and the events app with an example route demonstrating the new filtering capability.

Changes:

• Extend translateFilterToGraphql to support entityId on relation/backlink filters and emit relations vs backlinks appropriately.
• Add/adjust test coverage for relation/backlink exists and entityId filter translation cases.
• Document relation/backlink filtering by existence and by connected entity ID; add an events app demo route and a changeset.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/hypergraph/src/utils/translate-filter-to-graphql.ts	Adds entityId filter translation and differentiates forward relations vs backlinks in GraphQL filter output.
packages/hypergraph/src/entity/types.ts	Extends relation filter typing to accept entityId (string shorthand or object form).
packages/hypergraph/test/utils/translate-filter-to-graphql.test.ts	Adds tests for entityId filters on relations and backlinks; updates relation exists typing expectations.
docs/docs/filtering-query-results.md	Documents relation/backlink filtering by existence and by connected entity ID.
apps/events/src/schema.ts	Adds schemas used to demonstrate backlink filtering (Bounty, PersonBacklink).
apps/events/src/routes/bounties.lazy.tsx	New demo route showing entityId filtering on a backlink field.
apps/events/src/routes/__root.tsx	Adds navigation link to the new bounties route.
apps/events/src/routeTree.gen.ts	Updates generated route tree to include /bounties.
.claude/settings.local.json	Expands allowed tooling/devtools permissions.
.changeset/add-entity-id-relation-filter.md	Declares a minor version bump for the new filter capability.

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