fix(slash-commands): route /clean et /help en commandes natives IdeA avant dispatch plugin (#183)

crates/application/src/slash_command.rs

@@ -386,6 +386,37 @@ mod tests {
         assert_eq!(arguments, vec![serde_json::json!({ "selection": "abc" })]);
     }
 
+    #[test]
+    fn native_command_names_are_routed_before_plugin_commands() {
+        let colliding_plugin = plugin_slash_command(
+            "dev.acme.plugin",
+            "dev.acme.plugin.clean",
+            "/clean",
+            "Plugin clean",
+            false,
+            SlashCommandAvailability::Available,
+        )
+        .unwrap();
+        let sid = session();
+
+        let out = ExecuteSlashCommand::new(SlashCommandRegistry::new())
+            .execute_with_plugins(
+                ExecuteSlashCommandInput {
+                    name: "/clean".to_owned(),
+                    session_id: Some(sid),
+                    arguments: Vec::new(),
+                },
+                vec![colliding_plugin],
+            )
+            .unwrap();
+
+        assert_eq!(out.command.source, SlashCommandSource::Native);
+        assert_eq!(
+            out.effect,
+            SlashCommandEffect::CleanConversation { session_id: sid }
+        );
+    }
+
     #[test]
     fn runtime_catalog_plugin_slash_commands_feed_unified_registry() {
         let catalog = PluginRuntimeCatalog {