Expand AGENTS instructions (#130)

Author: syrusakbary

AGENTS.md

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+# Agent Instructions
+
+This repository provides a base library for building GraphQL servers across multiple Python web frameworks.
+
+## Project Structure
+- `src/graphql_server/` contains the library implementation.
+- `src/tests/` houses the unit tests.
+- `docs/` includes framework-specific documentation.
+- `pyproject.toml` defines project metadata and dependencies.
+- `noxfile.py` holds automation sessions for linting and testing.
+
+## Running Tests
+Run the full test suite with:
+
+```bash
+uv run pytest
+```