feat: establish project goals and architecture guidelines

AGENTS.md

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+# Project Goals & Architecture Guidelines
+
+## Goal
+This project aims to implement a modern Symfony application following a clean layered architecture.
+
+## Architecture
+The codebase is divided into three primary layers to ensure separation of concerns:
+
+- **UI Layer** (`src/UI`): Responsible for the presentation and handling user input (Controllers, Command-line interfaces, API endpoints).
+- **Logic Layer** (`src/Logic`): Contains the core business logic, domain services, and use cases. It is independent of the UI and Data layers.
+- **Data Layer** (`src/Data`): Handles data persistence and retrieval (Repositories, Entities, DTOs for external APIs).
+
+### Directory Structure
+The `src/` directory must strictly follow this layering:
+- `src/UI/`
+- `src/Logic/`
+- `src/Data/`