[codex] Add indexer query shape tests

[MyouzzZ]

Summary

• Add fixture-backed resolver shape tests for the market, order, and position GraphQL envelopes consumed by the web app.
• Assert the indexer schema and frontend query documents keep the selected field names aligned.
• Make the indexer test script run its existing build/codegen step first, and add the direct tslib devDependency required by importHelpers during SubQuery builds.

Fixes #338

Validation

• PASS: npm exec --yes bun -- test apps/s03-indexer/tests/queryResolverShape.test.ts
• PARTIAL: npm exec --yes bun -- run --cwd apps/s03-indexer test now runs codegen/build and the new query-shape tests pass; the command still exits non-zero on pre-existing failures in mappingHandlers.test.ts (indexes token mint event with zero-address from) and local sync-contracts.test.ts child-process bun resolution when Bun is invoked through npm exec.

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