test(codegen): add BM25 search integration test

[pyramation]

test(codegen): add BM25 search integration test

Summary

Adds integration tests that verify the codegen correctly handles BM25 (pg_textsearch) plugin-injected types — the same pattern as pgvector but for text search. This exercises the fix from #791 against a BM25-shaped schema.

New files:

• graphql/codegen/examples/example-bm25.schema.graphql — hand-crafted PostGraphile-style schema with Article/Post entities, Bm25SearchInput custom input type, plugin-injected bm25Body/bm25Content condition fields, and BM25_*_SCORE_ASC/DESC orderBy values
• graphql/codegen/src/__tests__/codegen/bm25-codegen-integration.test.ts — 13 integration tests exercising the full pipeline (FileSchemaSource → runCodegenPipeline → generateOrm)

What the tests verify:

• Bm25SearchInput (with query: String!, threshold?: Float) is generated as a TypeScript interface
• bm25Body / bm25Content plugin-injected condition fields appear in ArticleCondition / PostCondition
• BM25_BODY_SCORE_ASC/DESC and BM25_CONTENT_SCORE_ASC/DESC appear in orderBy union types
• Standard CRUD and filter types are still generated correctly (backwards compat)

No production code changes — test-only PR.

Review & Testing Checklist for Human

• Verify the fixture schema is realistic: example-bm25.schema.graphql is hand-crafted, not captured from a real PostGraphile introspection with Bm25SearchPlugin. Compare the condition type shape (e.g., bm25Body: Bm25SearchInput on ArticleCondition) and orderBy enum naming (BM25_BODY_SCORE_ASC) against what createBm25SearchPlugin() in graphile-pg-textsearch-plugin/src/bm25-search.ts actually produces. If the real plugin uses different field naming conventions or type wrapping, these tests would pass but miss real-world issues.
• Bm25SearchInput is simpler than VectorNearbyInput: It only references String and Float (built-in scalars), so this doesn't exercise transitive enum resolution the way the vector test does with VectorMetric. This is not a gap in the codegen fix, but worth noting for test coverage awareness.
• Run pnpm test in graphql/codegen/ to confirm all 320+ tests pass (13 new + existing).

Notes

• Follow-up to fix(codegen): include plugin-injected fields in condition/orderBy types + VectorFilter #791 (the core fix for plugin-injected codegen fields)
• Link to Devin session
• Requested by @pyramation

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