refactor(lint): rewrite structural linters from Ruby to PHP

Fold scripts/lint and scripts/linters/*.rb into a standalone Composer
project under scripts/linters/, matching the scripts/plugin-class-classifier/
convention. Uses no external packages, only PHP + Composer autoloading.

Verified byte-for-byte identical output against the original Ruby
implementation, both on the current repo (all linters pass) and on a
synthetic fixture exercising every violation type.

Entry point moves from `scripts/lint` to `scripts/linters/lint`.

1 files changed, 0 insertions, 50 deletions

diff --git a/scripts/linters/cargo_workspace_dependencies.rb b/scripts/linters/cargo_workspace_dependencies.rb
deleted file mode 100644
index 6e4278fb..00000000
--- a/scripts/linters/cargo_workspace_dependencies.rb
+++ /dev/null
@@ -1,50 +0,0 @@
-def cargo_workspace_dependencies(root_dir, excludes = [])
-  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
-    next [] if excludes.include?(relative)
-
-    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