dd contributor guide for deterministic quote tests

CONTRIBUTING.md

@@ -29,6 +29,16 @@ You can also use the helper targets from the `Makefile` at the repo root (`make
 
 Shared setup for `creator-keys` integration tests lives in `creator-keys/tests/contract_test_env/`. Import the module with `mod contract_test_env;` and call the small helpers (env with mocked auths, register contract, set key price, set fees, register a test creator) instead of duplicating boilerplate in every file.
 
+For guidance on writing deterministic quote tests, see [docs/deterministic-quote-tests.md](./docs/deterministic-quote-tests.md).
+
+## Documentation for contributors
+
+- **[CI Contract Checks](./docs/ci-contract-checks.md)**: Understanding the CI pipeline, running checks locally, and troubleshooting failures
+- **[Storage Key Invariants](./docs/storage-key-invariants.md)**: Storage model, key structure, and invariants that must be maintained across all operations
+- **[Deterministic Quote Tests](./docs/deterministic-quote-tests.md)**: Guide for writing tests for quote operations with the fixed price model
+- **[Fee Assumptions](./docs/fee-assumptions.md)**: Fee split logic, rounding behavior, and integration points
+- **[Error Codes](./docs/error-codes.md)**: Contract error reference with causes and expected caller behavior
+
 For testnet deployment steps, required CLI setup, and the release checklist used for contract updates, see [docs/stellar-testnet-deployment.md](./docs/stellar-testnet-deployment.md). For **wasm artifact** naming, retention, and metadata, see [docs/deploy-artifacts.md](./docs/deploy-artifacts.md). For how **clients and servers** should depend on contract read surfaces and events, see [docs/contract-consumer-boundaries.md](./docs/contract-consumer-boundaries.md).
 
 ## Contract contribution rules