Initial commit: Split Macha autonomous system into separate flake

Macha is now a standalone NixOS flake that can be imported into other
systems. This provides:

- Independent versioning
- Easier reusability
- Cleaner separation of concerns
- Better development workflow

Includes:
- Complete autonomous system code
- NixOS module with full configuration options
- Queue-based architecture with priority system
- Chunked map-reduce for large outputs
- ChromaDB knowledge base
- Tool calling system
- Multi-host SSH management
- Gotify notification integration

All capabilities from DESIGN.md are preserved.

README.md

@@ -0,0 +1,93 @@
+# Macha - AI-Powered Autonomous System Administrator
+
+Macha is an AI-powered autonomous system administrator for NixOS that monitors system health, diagnoses issues, and can take corrective actions with appropriate approval workflows.
+
+## Features
+
+- **Autonomous Monitoring**: Continuous health checks with configurable intervals
+- **Multi-Host Management**: SSH-based management of multiple NixOS hosts
+- **Tool Calling**: Comprehensive system administration tools via Ollama LLM
+- **Queue-Based Architecture**: Serialized LLM requests to prevent resource contention
+- **Knowledge Base**: ChromaDB-backed learning system for operational wisdom
+- **Approval Workflows**: Safety-first approach with configurable autonomy levels
+- **Notification System**: Gotify integration for alerts
+
+## Quick Start
+
+### As a NixOS Flake Input
+
+Add to your `flake.nix`:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    macha-autonomous.url = "git+https://git.coven.systems/lily/macha-autonomous";
+  };
+
+  outputs = { self, nixpkgs, macha-autonomous }: {
+    nixosConfigurations.yourhost = nixpkgs.lib.nixosSystem {
+      modules = [
+        macha-autonomous.nixosModules.default
+        {
+          services.macha-autonomous = {
+            enable = true;
+            autonomyLevel = "suggest";  # observe, suggest, auto-safe, auto-full
+            checkInterval = 300;
+            ollamaHost = "http://localhost:11434";
+            model = "gpt-oss:latest";
+          };
+        }
+      ];
+    };
+  };
+}
+```
+
+## Configuration Options
+
+See `module.nix` for full configuration options including:
+- Autonomy levels (observe, suggest, auto-safe, auto-full)
+- Check intervals
+- Ollama host and model settings
+- Git repository monitoring
+- Service user/group configuration
+
+## CLI Tools
+
+- `macha-chat` - Interactive chat interface
+- `macha-ask` - Single-question interface
+- `macha-check` - Trigger immediate health check
+- `macha-approve` - Approve pending actions
+- `macha-logs` - View service logs
+- `macha-issues` - Query issue database
+- `macha-knowledge` - Query knowledge base
+- `macha-systems` - List managed systems
+- `macha-notify` - Send Gotify notification
+
+## Architecture
+
+- **Agent**: Core AI logic with tool calling
+- **Orchestrator**: Main monitoring loop
+- **Executor**: Safe action execution
+- **Queue System**: Serialized Ollama requests with priorities
+- **Context DB**: ChromaDB for system context and learning
+- **Tools**: System administration capabilities
+
+## Requirements
+
+- NixOS with flakes enabled
+- Ollama service running
+- Python 3 with requests, psutil, chromadb
+
+## Documentation
+
+See `DESIGN.md` for comprehensive architecture documentation.
+
+## License
+
+[Add your license here]
+
+## Author
+
+Lily Miller