Revert "Revert "Rewrite extension management tools"" (#5273)

Signed-off-by: Angela Ning <aning@squareup.com>

crates/goose/src/agents/tool_route_manager.rs

@@ -17,6 +17,12 @@ pub struct ToolRouteManager {
     router_disabled_override: Mutex<bool>,
 }
 
+impl Default for ToolRouteManager {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ToolRouteManager {
     pub fn new() -> Self {
         Self {
@@ -97,9 +103,6 @@ impl ToolRouteManager {
         // Wrap selector in Arc for the index manager methods
         let selector_arc = Arc::new(selector);
 
-        // First index platform tools
-        ToolRouterIndexManager::index_platform_tools(&selector_arc, extension_manager).await?;
-
         if reindex_all.unwrap_or(false) {
             let enabled_extensions = extension_manager.list_extensions().await?;
             for extension_name in enabled_extensions {