only top level dockerfile

[xzrderek]

Note

Limit Dockerfile detection to only the project’s top-level Dockerfile and add tests to validate this behavior.

• CLI local-test:
  • Update _find_dockerfiles to return only ./Dockerfile (no recursive search).
• Tests:
  • Add test_find_dockerfiles_top_level_only to ensure only top-level Dockerfile is found.
  • Add test_find_dockerfiles_ignores_nested_only to ensure nested-only Dockerfiles are ignored.

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