siftdb-core 0.2.1

# siftdb-core

Core engine for SiftDB: a grep-native, agent-oriented database for code and text collections.

## Features
- Append-only storage with CRCs and frame format
- Line table generation with delta-varints
- Path and handle mapping
- O(1) inverted index for instant term lookups
- Memory-mapped FST indexes for efficient term storage
- Substring and regex search (via trigram index in earlier milestones)

## Quick Start
```bash
cargo add siftdb-core
```

## Example
```rust
use siftdb_core::SiftDB;

fn main() -> anyhow::Result<()> {
    let db = SiftDB::open("project.sift")?;
    let mut snapshot = db.snapshot()?;
    let hits = snapshot.find("async", Some("**/*.rs"), Some(10))?;
    for h in hits { println!("{}:{}: {}", h.path, h.line, h.text);}    
    Ok(())
}
```

## Performance
- 24M+ queries/sec for non-existent terms (pure O(1) lookup)
- Performance scales with number of matching files (O(k) processing)

See the root `benchmarks/README.md` for full methodology and results.

## License
MIT