Step-by-step guide to creating a custom Unity package from scratch and publishing it to GitHub for distribution via the Unity Package Manager (UPM). Covers the full workflow: setting up the package folder structure, writing package.json with proper naming conventions and semantic versioning, creating runtime and editor folders with assembly definition files to enforce code separation, writing a simple runtime API and editor menu item, testing the package locally and in a separate project, uploading to GitHub, and installing via Git URL. Also includes a maintenance checklist covering versioning, changelogs, API discipline, runtime/editor separation, and adding tests.
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