fix(build): Exclude symlink and unnecessary files

Some files, like AGENTS or RELEASING, are unnecessary for a packaged lib.

Some files, like symlinks for CLAUDE.md, can actually cause installation failures on Windows.

Fixes #496

Fixes #496

Author: weppos

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Changelog
 
 
+## Unreleased
+
+### Changed
+
+- Excluded symlinks and unnecessary files from gem packaging. On Windows symlinks cannot be created without Administrator privileges or with developer mode enabled #496.
+
+
 ## 7.0.1 - 2026-01-03
 
 ### Changed

public_suffix.gemspec

@@ -26,7 +26,18 @@ Gem::Specification.new do |s|
   s.files = Dir.chdir(__dir__) do
     `git ls-files -z`.split("\x0").reject do |f|
       (File.expand_path(f) == __FILE__) ||
-        f.start_with?(*%w[bin/ test/ .git .rubocop Gemfile Rakefile])
+        f.start_with?(*%w[
+          bin/
+          test/
+          .git
+          .rubocop
+          Gemfile
+          Rakefile
+          AGENTS.md
+          CLAUDE.md
+          RELEASING.md
+          CONTRIBUTING.md
+      ])
     end
   end
   s.require_paths = ["lib"]