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/no_std_collections_maps.rb b/scripts/linters/no_std_collections_maps.rb
deleted file mode 100644
index 3701d753..00000000
--- a/scripts/linters/no_std_collections_maps.rb
+++ /dev/null
@@ -1,50 +0,0 @@
-def no_std_collections_maps(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_std_map_usages(path, relative)
-  end
-
-  return true if errors.empty?
-
-  puts 'Found uses of `std::collections::{HashMap, HashSet, BTreeMap, BTreeSet}`.'
-  puts 'Use `indexmap::IndexMap` / `indexmap::IndexSet` instead:'
-  errors.each do |err|
-    puts "  #{err}"
-  end
-  false
-end
-
-BANNED_MAP_NAMES = %w[HashMap HashSet BTreeMap BTreeSet].freeze
-
-def find_std_map_usages(path, relative)
-  errors = []
-
-  File.readlines(path).each_with_index do |raw, idx|
-    code = raw.split('//', 2).first || raw
-
-    code.scan(/\bstd::collections::(HashMap|HashSet|BTreeMap|BTreeSet)\b/) do |m|
-      errors << "#{relative}:#{idx + 1}: use of `std::collections::#{m[0]}` (use `indexmap::#{indexmap_replacement(m[0])}` instead)"
-    end
-
-    code.scan(/\bstd::collections::\{([^}]*)\}/) do |m|
-      m[0].split(',').each do |entry|
-        name = entry.strip.split(/\s+as\s+/).first
-        next unless BANNED_MAP_NAMES.include?(name)
-
-        errors << "#{relative}:#{idx + 1}: import of `std::collections::#{name}` (use `indexmap::#{indexmap_replacement(name)}` instead)"
-      end
-    end
-  end
-
-  errors.uniq
-end
-
-def indexmap_replacement(name)
-  case name
-  when 'HashMap', 'BTreeMap' then 'IndexMap'
-  when 'HashSet', 'BTreeSet' then 'IndexSet'
-  end
-end