mctx-core 0.1.0

Runtime-agnostic and portable IPv4 multicast sender library.
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# Usage Guide

`mctx-core` keeps the send path small:

- build a `Context`
- add one or more `PublicationConfig` values
- send payloads through the returned `PublicationId`

Basic usage:

```rust
use mctx_core::{Context, PublicationConfig};
use std::net::Ipv4Addr;

let mut ctx = Context::new();
let id = ctx.add_publication(
    PublicationConfig::new(Ipv4Addr::new(239, 1, 2, 3), 5000)
        .with_ttl(4),
)?;

ctx.send(id, b"hello multicast")?;
```

Useful knobs:

- `with_interface(...)` chooses the multicast egress interface
- `with_source_port(...)` binds a deterministic source UDP port
- `with_ttl(...)` controls multicast hop count
- `with_loopback(...)` toggles local host loopback delivery

If you already manage sockets externally, use `add_publication_with_socket(...)`.