v4.0.0 Secure Execution, Working Directories & Project Modernization

[LeChatP]

Release v4.0: Secure Execution, Working Directories & Project Modernization

This pull request introduces significant updates across the project, including a major version bump to 4.0.0, Rust edition upgrade, new workspace member, enhancements to developer tooling, clarification of AI usage policy, and improvements to documentation and branding. The changes modernize the codebase, improve configuration and linting, and provide greater transparency around project practices. It introduces the working directory management. Implements the a secure execution crate

Project structure and versioning:

• Bumped project version to 4.0.0 and upgraded Rust edition to 2024 in Cargo.toml.
• Added rar-exec as a workspace member and dependency. [1] [2] [3]
• Changed the main binary path from src/sr/main.rs to src/dosr/main.rs to match the new project structure.

Tooling and configuration improvements:

• Updated .cargo/config.toml to refine coverage exclusions, adjust environment variable paths, and introduce new environment variables for workdir behavior. [1] [2] [3]
• Cleanup .vscode/launch.json with new debug configurations for integration and package tests, and added a prompt for test selection. Enhanced .vscode/settings.json for stricter linting and feature management with rust-analyzer. [1] [2]

Documentation and branding:

• Added AI_LETTER.md, a comprehensive letter on AI usage policy, transparency, and project philosophy.
• Updated README.md to feature the new hand-drawn mascot/logo, clarify logo licensing, add a research/publications section, update Rust version prerequisites, and reference the AI policy letter. [1] [2] [3] [4]

Dependency and feature management:

• Replaced several dependencies (e.g., switched from linked_hash_set to indexmap, updated toml and nonstick versions, removed unused dependencies) and adjusted feature flags for improved modularity and maintainability. [1] [2] [3]

Linting and code quality:

• Introduced stricter Clippy lints and feature management in Cargo.toml and .vscode/settings.json, enabling pedantic and nursery lints, and denying unwrap_used outside tests. [1] [2]

These changes collectively modernize the project, improve developer experience, clarify policies, and reinforce the project's commitment to transparency and quality.

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