Add BACH - Text-based OS for LLMs

[lukisch]

What is BACH?

BACH is a text-based operating system that enables LLMs to work autonomously with:

• Persistent memory (facts, lessons, working context)
• GTD-style task management with priorities & deadlines
• 262 tools for file processing, automation, analysis
• 945 reusable skills/workflows
• Agent framework for orchestration

GitHub: https://github.com/lukisch/bach
License: MIT

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