chore(lint): add Ruby linter scripts and apply rules

Adds scripts/lint with linters for mod.rs naming, contiguous use blocks,
use-as aliasing, sorted Cargo dependencies, std::collections maps, and
workspace dependency requirements. Renames mod.rs files, reorders use
statements, drops unnecessary import aliases, and sorts Cargo.toml
entries to satisfy the new rules.

1 files changed, 48 insertions, 0 deletions

diff --git a/scripts/linters/cargo_workspace_dependencies.rb b/scripts/linters/cargo_workspace_dependencies.rb
new file mode 100644
index 0000000..85305c9
--- /dev/null
+++ b/scripts/linters/cargo_workspace_dependencies.rb
@@ -0,0 +1,48 @@
+def cargo_workspace_dependencies(root_dir)
+  pattern = root_dir.join('crates', '*', 'Cargo.toml').to_s
+  errors = Dir.glob(pattern).sort.flat_map do |path|
+    relative = Pathname.new(path).relative_path_from(root_dir).to_s
+    find_non_workspace_deps(path, relative)
+  end
+
+  return true if errors.empty?
+
+  puts 'Found `[dependencies]` / `[dev-dependencies]` entries that do not use `workspace = true`.'
+  puts 'In a crate `Cargo.toml`, only `name.workspace = true` or `name = { workspace = true, ... }` is allowed:'
+  errors.each do |err|
+    puts "  #{err}"
+  end
+  false
+end
+
+def find_non_workspace_deps(path, relative)
+  errors = []
+  current_section = nil
+
+  File.read(path).each_line.with_index do |raw_line, idx|
+    stripped = raw_line.chomp.strip
+
+    if stripped =~ /\A\[([^\]]+)\]\z/
+      current_section = $1
+      next
+    end
+
+    next unless %w[dependencies dev-dependencies build-dependencies].include?(current_section)
+    next if stripped.empty? || stripped.start_with?('#')
+
+    if stripped =~ /\A([A-Za-z0-9_-]+)\.workspace\s*=\s*true\b/
+      next
+    elsif stripped =~ /\A([A-Za-z0-9_-]+)\s*=\s*\{(.+)\}\s*\z/
+      name = $1
+      inner = $2
+      next if inner =~ /\bworkspace\s*=\s*true\b/
+
+      errors << "#{relative}:#{idx + 1}: `#{name}` does not use `workspace = true`"
+    elsif stripped =~ /\A([A-Za-z0-9_-]+)\s*=/
+      name = $1
+      errors << "#{relative}:#{idx + 1}: `#{name}` does not use `workspace = true`"
+    end
+  end
+
+  errors
+end