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, 36 deletions

diff --git a/scripts/linters/no_decorative_section_comment.rb b/scripts/linters/no_decorative_section_comment.rb
deleted file mode 100644
index c9e30fe1..00000000
--- a/scripts/linters/no_decorative_section_comment.rb
+++ /dev/null
@@ -1,36 +0,0 @@
-def no_decorative_section_comment(root_dir, excludes = [])
-  pattern = root_dir.join('crates', '**', '*.rs').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_decorative_comments(path, relative)
-  end
-
-  return true if errors.empty?
-
-  puts 'Found decorative section comments (4+ consecutive `=`, `-`, or Unicode box-drawing characters).'
-  puts 'These section dividers are unnecessarily noisy — remove them:'
-  errors.each do |err|
-    puts "  #{err}"
-  end
-  false
-end
-
-DECORATIVE_RUN_RE = /[-=]{4,}|[─-╿]{4,}/
-
-def find_decorative_comments(path, relative)
-  errors = []
-
-  File.readlines(path).each_with_index do |raw, idx|
-    stripped = raw.lstrip
-    next unless stripped.start_with?('//')
-    next if stripped.start_with?('///') || stripped.start_with?('//!')
-
-    next unless stripped.match?(DECORATIVE_RUN_RE)
-
-    errors << "#{relative}:#{idx + 1}: decorative section comment"
-  end
-
-  errors
-end