Release v0.2.0

- Config loading from `~/.config/ait/config.toml` with built-in defaults (`serde` + `toml`)
- Safety layer: whitelist/blacklist glob matching for shell commands (`glob`)
- YOLO mode support (reads from config, skips confirmation for non-blacklisted commands)
- Confirmation dialog with single-keypress input (`crossterm` raw mode)
- Command execution via `sh -c` with stdout/stderr passthrough
- Editor support (`$EDITOR` / `vi` fallback) for editing commands before execution
- `ConfigError` typed errors via `thiserror`
- Multi-file module structure (`config.rs`, `safety.rs`, `exec.rs`)