Upon reflection, I would make the following improvements to bring the
interfaces closer to Go's philosophical ideals:
* Remove the App interface because it only has one implementation
* Remove the Named interface because all its usages seem to be replaceable
with a package-scoped const
* Split the Runnable interface into Runner and Shutdowner (inspired by
Reader/Writer) with the advice not to use Shutdowner if context-based
shutdown is sufficient
Redesigned interfaces:
```
type Runner interface {
Run(ctx context.Context) error
}
// Shutdowner adds a Shutdown method for services whose shutdown procedure
needs to be cancellable.
type Shutdowner interface {
Shutdown(ctx context.Context) error
}
```
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