Improve documentation/comments for game manager interface that menu calls

[Copilot]

This PR improves the documentation and naming of the GameManager interface methods to better reflect their actual usage patterns in the codebase.

Changes Made

Method Renaming and Documentation

• Renamed reset_game() to setup_game() to better reflect its purpose
• Added comprehensive comments explaining when each method is called:
  • setup_game(): Sets up initial game state when starting a new game from the main menu
  • restart_level(): Restarts the current level from the beginning when restarting from the pause menu

Code Updates

• Updated the method call in scripts/main.gd from GameManager.reset_game() to GameManager.setup_game()
• Updated all test files to reference the new method name and validate the correct interface

Context

The original method name reset_game() was misleading as it's specifically called when starting a new game, not when resetting during gameplay. The new name setup_game() more accurately describes its role in the game flow.

Usage patterns confirmed in the codebase:

• setup_game() is called in _on_game_menu_start_game() when starting a new game
• restart_level() is called in _on_game_menu_restart_game() when restarting from the pause menu

Fixes #4.

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[Copilot]

Pull Request Overview

This PR renames the misleading reset_game() method to setup_game(), updates all calls and tests accordingly, and adds inline documentation to clarify when each GameManager method is invoked.

• Renamed reset_game to setup_game and updated all code & tests to match
• Added comments to setup_game() and restart_level() explaining their triggers
• Updated scripts/main.gd and relevant unit tests to use the new method name

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/unit/test_integration.gd	Updated test to assert setup_game exists
test/unit/test_game_manager.gd	Renamed test and call from reset_game to setup_game
scripts/main.gd	Changed GameManager.reset_game() to GameManager.setup_game()
scripts/gamemanager.gd	Renamed method and added detailed documentation