Temporal state-window recording and comparison.

dotnet add package Spanfold --version 0.1.0-preview.2
dotnet add package Spanfold.Testing --version 0.1.0-preview.2

`Spanfold.Testing` is optional. It provides fixtures, snapshots, and assertions for consumer tests.

cargo add spanfold@0.1.1
cargo install spanfold-cli --version 0.1.1

The Rust package supports the core comparison API, selector-backed plans, Episode analytics, deterministic exports, audit bundles, and CLI workflows.

using Spanfold;

var pipeline = Spanfold.Spanfold
    .For<DeviceSignal>()
    .RecordWindows()
    .TrackWindow(
        "DeviceOffline",
        key: signal => signal.DeviceId,
        isActive: signal => !signal.IsOnline);

pipeline.Ingest(new DeviceSignal("device-17", false), source: "provider-a");
pipeline.Ingest(new DeviceSignal("device-17", true), source: "provider-a");

public sealed record DeviceSignal(string DeviceId, bool IsOnline);

use spanfold::for_events;

#[derive(Clone)]
struct DeviceSignal {
    device_id: String,
    is_online: bool,
}

let mut pipeline = for_events::<DeviceSignal>()
    .record_windows()
    .track_window(
        "DeviceOffline",
        |signal| signal.device_id.clone(),
        |signal| !signal.is_online,
    )
    .build();

pipeline.ingest(
    DeviceSignal { device_id: "device-17".into(), is_online: false },
    Some("provider-a"),
    None,
);
pipeline.ingest(
    DeviceSignal { device_id: "device-17".into(), is_online: true },
    Some("provider-a"),
    None,
);