refactor: Refactor the project's docs, scripts, and instructions, and add CI

[Li0k]

This pull request introduces significant improvements to the development workflow, documentation, and configuration management for the project. The main highlights include the addition of a comprehensive agent workflow guide, migration to modern dependency management with uv, improved CI/CD automation, and updates to documentation and configuration files to reflect these changes.

Development workflow and automation improvements:

• Added a detailed operational workflow and developer guide in AGENTS.md, outlining setup, testing, formatting, building, publishing, and review checklists for contributors.
• Introduced a GitHub Actions CI pipeline in .github/workflows/ci.yml for automated linting, testing, and strict type checking on pull requests.
• Added a .pre-commit-config.yaml to standardize code formatting and linting using black, isort, and ruff, with hooks for YAML and whitespace checks.

Dependency and packaging updates:

• Migrated from requirements.txt to uv for dependency management, updating the Dockerfile, MANIFEST.in, and related scripts for improved reproducibility and performance. [1] [2] [3]
• Updated installation and packaging instructions in README.md to use uv and new scripts, removing references to legacy commands and files. [1] [2] [3] [4] [5]

Configuration and documentation enhancements:

• Added the MEMORY_ENABLED option to .env.example and README.md, clarifying memory management configuration. [1] [2]
• Updated default model names and usage examples to reflect the latest Anthropic Claude model (claude-3-5-sonnet-20241022) throughout documentation and configuration templates. [1] [2] [3]
• Improved quickstart and workflow documentation in README.md, referencing AGENTS.md for detailed developer instructions, and updated test commands for consistency. [1] [2]

Code cleanup and formatting:

• Applied formatting and minor code style improvements to agent/base.py for consistency and readability, without changing core logic. [1] [2] [3] [4] [5] [6] [7] [8]

These changes collectively modernize the project's workflow, streamline development, and ensure a consistent experience for contributors and users.