Runtime packages
runtime contains public runtime APIs that generated pzero services may import
directly. Each capability uses a direct package path, such as
runtime/migrator. These packages are part of the service compatibility
boundary and should evolve with backward compatibility in mind.
New service-facing runtime capabilities, such as tracing, authentication,
middleware, messaging, configuration, and health checks, should prefer this
layer. Existing core packages remain unchanged and can be evaluated
individually instead of being moved as part of an unrelated change.
Generator and CLI implementation code remains under cmd/pzero.