Add Gemfile.lock

This ensures reproducible builds in CI and development environments
by locking dependency versions. While gems libraries traditionally
omit the lock file, including it provides consistent tooling versions
(rubocop, rake, etc.) across all contributors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: horgh

.gitignore

@@ -1,5 +1,3 @@
 *.swp
 /doc
 /.yardoc
-Gemfile.lock
-

Gemfile.lock

@@ -0,0 +1,72 @@
+PATH
+  remote: .
+  specs:
+    maxmind-db (1.4.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.3)
+    json (2.16.0)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
+    minitest (5.26.2)
+    parallel (1.27.0)
+    parser (3.3.10.0)
+      ast (~> 2.4.1)
+      racc
+    prism (1.6.0)
+    racc (1.8.1)
+    rainbow (3.1.1)
+    rake (13.3.1)
+    regexp_parser (2.11.3)
+    rubocop (1.81.7)
+      json (~> 2.3)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.48.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.4)
+    rubocop-minitest (0.38.2)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.38.0, < 2.0)
+    rubocop-performance (1.26.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+    rubocop-rake (0.7.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.72.1)
+    rubocop-thread_safety (0.7.3)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+      rubocop-ast (>= 1.44.0, < 2.0)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (3.2.0)
+      unicode-emoji (~> 4.1)
+    unicode-emoji (4.1.0)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  maxmind-db!
+  minitest
+  rake
+  rubocop
+  rubocop-minitest
+  rubocop-performance
+  rubocop-rake
+  rubocop-thread_safety
+
+BUNDLED WITH
+   2.6.9