chore: remove obsolete config.json references

Deleted the `config.json` entry from the package file list and removed the corresponding `CONFIG_FILE` constant, cleaning up unused configuration references.

package.json

@@ -44,7 +44,6 @@
     "storage/",
     "engine262/lib/",
     "graphology/",
-    "config.json",
     "AGENTS.md",
     "README.md"
   ],

src/constants.ts

@@ -2,7 +2,6 @@ export const STORAGE_DIR = "./storage";
 export const SPEC_DIR = "./spec-built/multipage";
 export const CODE_DIR = "./engine262/src";
 export const GRAPH_FILE = "./graphology/graph.json";
-export const CONFIG_FILE = "./config.json";
 
 // Model configurations
 export const EMBEDDING_MODEL = "qwen3-embedding:0.6b";