feat: add panic tracking and logging with PanicTracker

- Implemented PanicTracker to log panics using tracing within a dedicated span.
- Introduced PanicInfo struct to capture panic details.
- Added tests for panic catching and hook restoration.

feat: implement token-bucket rate limiter

- Created RateLimiter to manage token consumption with configurable rates and burst capacity.
- Added methods for acquiring tokens and checking available tokens.
- Included tests for rate limiting behavior and token availability.

feat: add automatic retry with exponential backoff

- Developed retry function to handle transient errors with configurable retry strategies.
- Introduced RetryConfig for customizing retry behavior and jitter.
- Added tests for various retry scenarios and error handling.

feat: implement graceful shutdown coordination

- Created ShutdownManager to manage shutdown signals and task completion.
- Introduced ShutdownSignal for tasks to observe shutdown requests.
- Added tests for shutdown request handling and task draining.

feat: add timeout functionality for async operations

- Implemented with_timeout function to enforce execution time limits on futures.
- Created Timeout struct for wrapping futures with a deadline.
- Added tests for timeout behavior and error mapping.

crates/corex-event/README.md

@@ -0,0 +1,36 @@
+# corex-event
+
+A unified events & message bus abstraction so component-to-component (or
+service-to-service) communication isn't locked to one transport.
+
+- **In-memory dispatcher** (default) — `tokio::sync::broadcast`-backed
+  pub/sub for communication inside a single process (monolith).
+- **Distributed broker backends** — RabbitMQ (`amqp`) and NATS (`nats`)
+  behind the same `EventBus` trait, so swapping the backend doesn't change
+  handler code.
+- **Typed convenience** — `TypedEventBus` layers JSON encoding on top.
+
+## Features
+
+- `mem` (default) — in-memory dispatcher.
+- `amqp` — RabbitMQ via `lapin` (pure Rust AMQP 0.9.1 client).
+- `nats` — NATS via `async-nats`.
+
+## Usage
+
+```rust
+use corex_event::{InMemoryEventBus, TypedEventBus};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+struct OrderCreated { id: u64 }
+
+let bus = TypedEventBus::new(InMemoryEventBus::default());
+let mut sub = bus.subscribe::<OrderCreated>("orders").await?;
+bus.publish("orders", &OrderCreated { id: 42 }).await?;
+let event = sub.recv().await?;
+```
+
+Swap `InMemoryEventBus::default()` for `AmqpEventBus::connect(url, "exchange").await?`
+or `NatsEventBus::connect(url).await?` to move to a distributed broker without
+touching handler code.