Lock down indexer query result shapes

[kitWarse]

Summary

• Added a focused query result shape contract for frontend-consumed indexer results.
• Added deterministic fixture-backed tests for markets, positions, and orders.
• The tests verify exact field names and runtime value types for the nested query nodes used by frontend hooks.

Issue

• Closes Indexer: GraphQL query resolver shape #338

Changes

• Added �pps/s03-indexer/src/queryResultShapes.ts with shape definitions and an assertion helper.
• Added �pps/s03-indexer/tests/query-result-shapes.test.ts to seed fixture entities, query markets/positions/orders, and assert stable result shapes.

Validation

• Ran: �un test apps/s03-indexer/tests/query-result-shapes.test.ts
• Result: 3 pass, 0 fail.

Notes

• Full CI/package validation was not run locally per request.

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