feat: update README for clarity and structure, add learning objectives and banner image; update .gitignore for VSCode

docs: update README to enhance clarity and structure, add missing sections

docs: update README to clarify project purpose and structure

feat: initialize project structure with Cargo.toml and main.rs, add agent, context, harness, and tools modules

feat: add .gitignore to exclude build artifacts and IDE files

docs: add initial README