agent-context 0.1.0

Multi-backend agent context manager with three-zone memory model
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# agent-context

Multi-backend LLM conversation context manager built on the [kameo](https://crates.io/crates/kameo) actor model.

## Three-Zone + Scratch Memory

Messages are split into three storage zones plus a transient scratch layer:

| Zone | Mutability | Purpose |
|------|-----------|---------|
| **immutable** | Read-only | System prompts, preset context |
| **compressed** | Write-once (during compression) | Summaries of older messages |
| **incremental** | Full CRUD | Active conversation |
| **scratch** | Not stored | Per-turn metadata (time, cwd, etc.) |

Concatenation order: immutable → compressed → incremental → scratch.

## Usage

```rust
use agent_context::{AgentContext, AppendMsg, SendMsg, ContextBackend};

// 1. Implement ContextBackend for your LLM backend
// 2. Spawn the actor
let actor = AgentContext::spawn(AgentContext::new(backend, vec![system_prompt]));

// 3. Append user message and send to LLM
actor.ask(AppendMsg { message: user_msg }).await?;
actor.ask(SendMsg { opts: my_opts }).await?;

// 4. Read all messages
let messages = actor.ask(MessagesMsg).await?;
```

## ContextBackend

The core trait — implement it to support any LLM provider. Provides message factories, format conversion, response parsing, and streaming.

## Compression

Use `CompressMsg` with `CompressStrategy::Summarize` to compress older messages into a summary when the conversation gets too long.

## License

MIT OR Apache-2.0