Add comprehensive CODE_SUMMARY.md documentation for codebase overview

[Copilot]

Summary

Added a comprehensive CODE_SUMMARY.md documentation file that provides a complete rundown of how the Rivals for Catan implementation operates, addressing the request for information about functionalities, class/folder relationships, and communication flows.

What's Included

The new CODE_SUMMARY.md file (724 lines) contains:

1. Core Functionalities Overview

Detailed documentation of all major functional areas:

• Game Management: Initialization, turn sequencing, victory tracking, event system
• Card & Deck Management: Organization of 49 center cards, 36 basic cards, and 9 event cards
• Placement & Building: Settlement, road, city, and building placement with rule validation
• Resource & Trade Management: 5 resource types with bank and player-to-player trading
• Special Effects: 40+ unique card effects across action cards, events, buildings, and units
• I/O Systems: Console, network, and mock I/O implementations
• Testing Infrastructure: 20+ test classes covering all major features

2. Relationship Between Classes and Folders

Complete structural analysis of the codebase:

• Package structure showing all 21 directories and their purposes
• Layered architecture breakdown (Presentation → Application → Business → Domain → Infrastructure)
• Class organization: 56 controller classes, 12 model classes distributed across specialized subdirectories
• Dependency flows and relationships between packages
• Design patterns used throughout (Strategy, Registry, Factory, Dependency Injection, etc.)

3. Communication Flow Documentation

Six detailed flow diagrams explaining:

• Application Startup Flow: 11-step initialization process from Main.java to game loop
• Turn Execution Flow: Complete 7-phase turn sequence (pre-roll, event die, production, action, replenish, exchange, victory check)
• Card Effect Execution Flow: Step-by-step process with concrete examples (Goldsmith, Merchant Caravan, Road Building, Abbey, Scout)
• Placement Validation Flow: Detailed validation rules for all structure types
• Network Multiplayer Flow: Host and client connection sequence
• Data Flow: Complete path from cards.json through the system to display

4. Additional Documentation

• SOLID principles adherence analysis with code examples
• Modifiability & extensibility features demonstrating how to extend the system
• Technology stack details (Java, Gson, JUnit)
• Execution instructions for compilation and running
• Key strengths summary

Impact

This documentation provides:

• Onboarding resource for new developers joining the project
• Architecture reference for understanding system design decisions
• Maintenance guide showing how components interact and can be modified
• Stakeholder overview explaining what the system does and how it works

Changes Made

• ✅ Added CODE_SUMMARY.md (new file)
• ✅ No existing code modified (documentation only)
• ✅ No changes to functionality or behavior

The summary complements existing documentation (README, ARCHITECTURE, FOLDER_STRUCTURE, FOLDER_CONNECTIONS, GAME_FLOW) by consolidating and explaining the operational aspects of the codebase in a single, comprehensive reference document.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Symmery of code</issue_title>
<issue_description>Dear code agent,
Can you give me an run down on how the code operates

• Functionalities
• relationship between classes and folders
• Communications flow</issue_description>

<agent_instructions>Do not change or add some code in the excisting project on dev2 branch. Just give me a summery report</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #15

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