fix: remove unused MetaPluginType variants

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/services/item_service.rs

@@ -341,11 +341,7 @@ impl ItemService {
         drop(writer);
 
         let plugin_types = vec![
-            MetaPluginType::FileMime,
-            MetaPluginType::FileEncoding,
             MetaPluginType::Binary,
-            MetaPluginType::LineCount,
-            MetaPluginType::WordCount,
             MetaPluginType::Digest,
             MetaPluginType::User,
             MetaPluginType::Hostname,

src/services/meta_service.rs

@@ -34,12 +34,7 @@ impl MetaService {
                 
                 // Get the plugin name to find its configuration
                 let plugin_name = match meta_plugin_type {
-                    MetaPluginType::FileMagic => "file_magic",
-                    MetaPluginType::FileMime => "file_mime",
-                    MetaPluginType::FileEncoding => "file_encoding",
                     MetaPluginType::MagicFile => "magic_file",
-                    MetaPluginType::LineCount => "line_count",
-                    MetaPluginType::WordCount => "word_count",
                     MetaPluginType::Cwd => "cwd",
                     MetaPluginType::Binary => "binary",
                     MetaPluginType::Text => "text",
@@ -51,6 +46,7 @@ impl MetaService {
                     MetaPluginType::ReadTime => "read_time",
                     MetaPluginType::ReadRate => "read_rate",
                     MetaPluginType::Hostname => "hostname",
+                    MetaPluginType::Program => "program",
                 };
                 
                 // Get options and outputs from settings