SE-0563: Improve Interaction Between `@main` and Top-Level Code

Hello, Swift community! The review of SE-0563: Improve Interaction Between @main and Top-Level Code begins now and runs through November 17, 2026. Reviews are an important part of the Swift evolution process. All review feedback should be either on this forum thread or, if you would like to keep your feedback private, directly to me as the review manager by email or DM. When contacting the review manager directly, please put "SE-0563" in the subject line. Trying it out Toolchains with the lat...