Agent Skills: melpa-packaging

This skill should be used when the user prepares an Emacs Lisp package for MELPA submission, writes or reviews a MELPA recipe, decides which files ship in a package, resolves package-lint or checkdoc findings, aligns package headers (Package-Requires, Version, URL, Author, Maintainer), or handles the period between opening a MELPA pull request and acceptance. Trigger on mentions of MELPA, recipe, :files, package-build, package-lint, checkdoc, or *-pkg.el.