Sausage spike: host (broker, supervisors, commit-on-close fs, cargo actor, console), agent actor, examples

examples/crasher/Cargo.toml

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+[package]
+name = "crasher"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

examples/crasher/src/main.rs

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+//! A bad version: it starts, waits 3 seconds (long enough for the smoke
+//! test), then panics. Used to test the automatic rollback.
+fn main() {
+    std::thread::sleep(std::time::Duration::from_secs(3));
+    panic!("this version is broken");
+}