Add config reader support

[JasonHonKL]

This PR aims to provide a config reader that can read a JSON file configuration. It has not yet been integrated with other code, so it is safe to merge. Additionally, I have included an example config file.

[greptile-apps]

Greptile Summary

This PR introduces a JSON configuration system for the Plexe AI framework by adding a ModelConfigFactory class that can parse configuration files and create ModelBuilder instances. The implementation includes three main components: a configuration parser (model_config.py) with dataclasses for provider and general settings, an example JSON configuration file (plexe.json) that demonstrates how to specify different LLM providers for various agent roles, and a minimal README for the new CLI directory structure.

The configuration system allows users to externalize provider settings, working directories, and other parameters instead of hardcoding them when instantiating ModelBuilder objects. The JSON structure mirrors the existing ProviderConfig class fields, maintaining compatibility with the current architecture. The factory pattern encapsulates the complex parsing logic while providing a clean interface through the get_model_builder() method.

The PR establishes the foundation for a more flexible, deployment-friendly configuration approach where settings can be managed separately from code. The configuration supports a provider hierarchy with defaults and specialized providers for different agent roles, along with system-wide settings for verbosity and distributed processing.

Important Files Changed

Files Modified

Filename	Score	Overview
plexe/cli/model_config.py	3/5	Adds JSON configuration parser with dataclasses and factory, but has error handling and validation issues
plexe/cli/plexe.json	4/5	Example JSON config file demonstrating provider hierarchy and system settings
plexe/cli/README.md	5/5	Minimal placeholder README with just a header for the CLI directory
plexe/cli/init.py	1/5	Breaking change that removes all existing CLI module exports, making previously accessible classes unavailable

Confidence score: 2/5

• This PR contains a critical breaking change that will immediately break existing code importing from plexe.cli
• Score reflects the removal of all CLI module exports without replacement, despite the PR description claiming it's safe to merge
• Pay close attention to plexe/cli/__init__.py which removes the entire public API for the CLI module

Sequence Diagram

sequenceDiagram
    participant User
    participant ModelConfigFactory
    participant FileSystem as "File System"
    participant ModelBuilder
    participant ProviderConfig

    User->>ModelConfigFactory: "__init__(config_file='./plexe.json')"
    ModelConfigFactory->>FileSystem: "open(config_file, 'r')"
    FileSystem-->>ModelConfigFactory: "file handle"
    ModelConfigFactory->>FileSystem: "json.load(f)"
    FileSystem-->>ModelConfigFactory: "config data"
    
    alt Config validation fails
        ModelConfigFactory->>ModelConfigFactory: "validate data exists"
        ModelConfigFactory-->>User: "Exception: Config Error"
    else Config validation passes
        ModelConfigFactory->>ModelConfigFactory: "ModelProviderJSONConfig(**data['provider'])"
        ModelConfigFactory->>ModelConfigFactory: "validate default_provider"
        ModelConfigFactory->>ModelConfigFactory: "set null providers to default_provider"
        ModelConfigFactory->>ModelConfigFactory: "ModelJSONConfig(provider=model_provider, ...)"
    end
    
    User->>ModelConfigFactory: "get_model_builder()"
    ModelConfigFactory->>ProviderConfig: "ProviderConfig(default_provider, orchestrator_provider, ...)"
    ProviderConfig-->>ModelConfigFactory: "provider_config"
    ModelConfigFactory->>ModelBuilder: "ModelBuilder(provider_config, verbose, distributed, working_dir)"
    ModelBuilder-->>ModelConfigFactory: "model_builder instance"
    ModelConfigFactory-->>User: "model_builder instance"

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