Fix Config import error by adding missing Config class to ai_evo/config.py

[Copilot]

Problem

The repository had a critical import error preventing the application from running. The main entry point and test files were trying to import a Config class from ai_evo.config, but this class was completely missing from the config.py file.

# This was failing with ImportError
from ai_evo.config import Config

Error: ImportError: cannot import name 'Config' from 'ai_evo.config'

The ai_evo/config.py file only contained an RNG class, leaving the Config class undefined despite being used throughout the codebase in:

• main.py - Main application entry point
• Multiple test files (test_energy.py, test_integration.py, etc.)
• Core simulation modules (simulation.py, evolution.py)

Solution

Added the missing Config class to ai_evo/config.py with comprehensive configuration parameters based on usage analysis throughout the codebase.

Key Features of the Config Class

Flexible Configuration:

# Default configuration
config = Config()

# Custom parameters
config = Config(seed=123, width=200, height=150, mutation_rate=0.15)

Complete Parameter Coverage:

• World settings: width, height, seed
• Simulation control: max_steps, snapshot_every
• Population: init_herbivores, init_carnivores
• Energy system: min_energy, max_energy
• Environment: plant_growth_rate, plant_cap
• Feeding mechanics: herbivore_bite_cap, carnivore_gain_eff
• Movement & reproduction: move_cost_base, reproduce_cost_frac
• Evolution: mutation_rate, mutation_strength, perception_max
• Spatial optimization: grid_cell

Implementation Details

The Config class uses keyword arguments with sensible defaults, making it backward compatible with all existing usage patterns found in the codebase:

class Config:
    def __init__(self, **kwargs):
        self.width = kwargs.get('width', 100)
        self.height = kwargs.get('height', 100)
        self.seed = kwargs.get('seed', 42)
        # ... additional parameters

Verification

✅ Import resolution: from ai_evo.config import Config now works
✅ Parameter support: All configuration patterns from tests and main code work
✅ Backward compatibility: Existing RNG class remains unchanged
✅ Ready to use: Main application can now initialize properly

Impact

This is a surgical fix that resolves the core import issue with minimal changes:

• Single file modified: Only ai_evo/config.py
• No breaking changes: Existing code continues to work unchanged
• Comprehensive solution: Supports all discovered configuration requirements

The application can now run without the fundamental import error that was blocking basic functionality.

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