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In your local Controller directory, the autowiring/autoconfig is enabled by the Yaml configuration.

In a package, you are expected to explicitly list your dependencies in the configuration. This would be setup by reading the configuration from the bundle or bridge config.

The directory you show doesn't seem to be a bundle (it doesn't have a name that indicates it - but it might still have the appropriate files), so if it is a simple package (without the Symfony framework structure to define services), you would want to add another package that was a thin layer making services from a plain-php package that it depends on.