Add tool annotations to all Everything server tools

Previously only get-annotated-message had ToolAnnotations. Now all 18
tools explicitly declare readOnlyHint, destructiveHint, idempotentHint,
and openWorldHint so the server serves as a complete reference for
developers implementing tool annotations per the MCP spec.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/everything/tools/echo.ts

@@ -13,6 +13,12 @@ const config = {
   title: "Echo Tool",
   description: "Echoes back the input string",
   inputSchema: EchoSchema,
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+    openWorldHint: false,
+  },
 };
 
 /**