feat(rust): add initial aios-rs scaffold with core traits and README …

[rajakarthik-zenteiq-ai]

…integration

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[rajakarthik-zenteiq-ai]

This pull request introduces an experimental Rust rewrite scaffold for the AIOS framework, laying the foundation for incremental porting and performance-focused development. It adds a new aios-rs crate with core trait definitions and minimal in-memory and filesystem-backed implementations for subsystems such as context, memory, storage, tool, scheduler, and LLM adapter. The documentation has been updated to explain usage, roadmap, and contribution guidelines.

Core Rust scaffold and trait definitions:

• Added the aios-rs crate with Cargo.toml specifying metadata and dependencies.
• Implemented core traits and minimal reference implementations for context (context.rs), memory (memory.rs), storage (storage.rs), tool (tool.rs), scheduler (scheduler.rs), and LLM adapter (llm.rs). [1] [2] [3] [4] [5] [6]
• Provided a convenient prelude.rs to simplify usage by re-exporting primary traits and structs.
• Added crate-level documentation and a version constant in lib.rs.

Documentation and onboarding:

• Updated the main README.md to announce the Rust rewrite, provide usage examples, and outline a development roadmap.
• Added a dedicated aios-rs/README.md detailing status, goals, quick start, example usage, and contribution guidelines.