Implement Comprehensive Project Documentation

[TKanX]

Description:

With the core logic and configuration system now stabilized, the project requires a full suite of documentation to be considered complete and ready for public use. This effort will establish a professional standard for user guides, API references, and contributor information, making the project accessible to its diverse target audiences.

The documentation will be structured to serve three distinct groups: end-users who will interact with the CLI, developers who will consume the screampp Rust library, and future contributors who will maintain or extend the codebase.

Tasks:

• Phase 1: Implement Library API Documentation

  • Crate-Level Documentation: Add a //! doc comment to crates/scream-core/src/lib.rs that provides a high-level overview of the library's purpose and a complete usage example for the primary workflow.
  • Public API Surface: Add /// doc comments to all public items (pub structs, enums, functions, traits) in the screampp crate. Focus on modules intended for user interaction, such as workflows, engine::config, engine::state, and core::models.
  • Audit & Validation:
    • Run cargo doc --package screampp and ensure there are no warnings for missing public documentation.
    • Verify all code snippets in # Examples blocks compile and pass via cargo test --doc.

• Phase 2: Create User-Facing Guides

  • CLI Usage Documentation: In the root README.md, create a new "Command-Line Usage" section with:
    • Installation instructions.
    • A "Quick Start" guide demonstrating the minimal required arguments.
    • An example of usage with a config.toml file.
  • Library Usage Documentation: In the README.md, create a new "As a Library" section with:
    • Instructions for adding screampp to a project's Cargo.toml.
    • A prominent link to the full API documentation on docs.rs.
    • A copy of the primary usage example from lib.rs.

• Phase 3: Develop Contributor and Architecture Documentation

  • Contribution Guide: Create a CONTRIBUTING.md file detailing the development setup, how to run tests, and the code style standards (cargo fmt, cargo clippy).
  • Architecture Overview: Add an "Architecture" section to the README.md (or a separate docs/architecture.md) that explains:
    • The responsibilities of each crate in the workspace.
    • The high-level design of the scream-cli crate's commands and config modules.
  • Project Roadmap: Add a "Roadmap" section to the README.md to clearly define the project's future direction and scope, listing planned features like design mode and Python bindings.

• Phase 4: Finalize for Publishing

  • Metadata Completion: Update crates/scream-core/Cargo.toml with all necessary metadata for publishing (description, keywords, categories, etc.).
  • Pre-flight Check: Successfully run cargo publish --dry-run --package screampp to validate the package without uploading.