Embed the engine

This is the repository Quickstart, extracted mechanically from the first Rust block in README.md. That block is byte-compared with the compiled crates/oce-api/examples/quickstart.rs example.

Before connecting real equipment, read Host responsibilities. The host owns sample quality, missing-data, timing, fault, and safe-state policy.

use oce_api::{CollectSpec, Engine, InputSource, SimSpec, Value};

const ECONOMIZER: &str = "http://example.org#g36.ahu_economizer";
const ECONOMIZER_ENABLED: &str = "http://example.org#g36.ahu_economizer.enableLatch.y";
const DAMPER_COMMAND: &str = "http://example.org#g36.ahu_economizer.damperSwitch.y";
const OA_TEMPERATURE_DELTA: &str = "http://example.org#g36.ahu_economizer.returnMinusOutdoor.y";

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // An engine with the default in-memory store — no database.
    let mut engine = Engine::in_memory();

    // Parse, validate, and freeze the schedule.
    let cxf_bytes = std::fs::read("crates/oce-cxf/tests/fixtures/g36/ahu_economizer.jsonld")?;
    engine.load_cxf(&cxf_bytes)?;

    // Simulate: feed inputs per tick, collect named outputs.
    let metrics = engine.simulate(&SimSpec {
        t_start: 0.0,
        t_stop: 4.0,
        step: 1.0,
        inputs: InputSource::Closure(Box::new(|t| {
            vec![
                (format!("{ECONOMIZER}.return_air_temp"), Value::Real(24.0)),
                (
                    format!("{ECONOMIZER}.outdoor_air_temp"),
                    Value::Real(18.0 + t),
                ),
                (format!("{ECONOMIZER}.operating_mode"), Value::Integer(1)),
            ]
        })),
        collect: CollectSpec::Named {
            points: vec![
                ECONOMIZER_ENABLED.to_string(),
                DAMPER_COMMAND.to_string(),
                OA_TEMPERATURE_DELTA.to_string(),
            ],
            stride: 1,
        },
    })?;

    println!("times: {:?}", metrics.trace.times());
    for (index, name) in metrics.trace.columns().iter().enumerate() {
        println!(
            "{name}: {:?}",
            metrics.trace.column(index).unwrap_or_default()
        );
    }
    Ok(())
}

Continue with Architecture and CDL coverage.