[jimmyt857]

Summary

• Replace the old examples module with two user-facing py_image modules: rules_oci with aspect_rules_py, and rules_img with rules_python. Each call site is only name and a py_binary.
• Move the previous examples into focused end-to-end modules, and keep package types and lock parsing on the public boundary of layers, inference, apt, and python.
• Document apt and environment inference, package-size configuration, and why the same layer split applies to other languages whose third-party packages stay intact at runtime.

Test plan

• bazel test //... at the repo root
• bazel test //... in both examples/py_image_with_* modules
• bazel test //... in each e2e/* module, including e2e/minimum on Bazel 8.7
• Confirm the image tests load and run the example images

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