cu-msp-bridge 0.13.0

Copper bridge to talk to MSP devices over serial.
Documentation 
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# cu-msp-bridge

Bridge that combines the MSP source/sink tasks into one serial transport. It exposes a single TX channel (`requests`) that accepts batches of [`cu_msp_lib::structs::MspRequest`] messages and a single RX channel (`responses`) that yields [`MspResponse`] batches decoded from the line.

## Resources and configuration

The bridge expects a `serial` resource. For std targets, use
`cu_linux_resources::LinuxResources` as the provider. It opens serial devices
and exposes fixed serial slots such as `<bundle>.serial0` through `<bundle>.serial5`.
For serial config keys (`serialN_dev`, `serialN_baudrate`, parity/stopbits/timeout), see
[`cu_linux_resources` README: Config Keys / Serial](../../res/cu_linux_resources/README.md#serial).

```ron
resources: [
  (
    id: "linux",
    provider: "cu_linux_resources::LinuxResources",
    config: { "serial3_dev": "/dev/ttyUSB0", "serial3_baudrate": 115200 },
  ),
],
bridges: [
  (
    id: "msp_bridge",
    type: "cu_msp_bridge::CuMspBridgeStd",
    resources: { serial: "linux.serial3" },
    channels: [ Tx (id: "requests"), Rx (id: "responses") ],
  ),
],
```

For embedded targets, provide your own bundle that moves the UART into the `ResourceManager` as an owned resource. If your UART type is not `Sync`, wrap it once at bundle registration time with `cu_linux_resources::Exclusive<T>`. See `examples/cu_elrs_bdshot_demo` and `examples/cu_msp_bridge_loopback` for end-to-end wiring and config mutation.