Update the package name to 'mux' (#546)

I've updated the `mux` NPM to use the GitHub Actions auth too.

Author: kylecarbs

bun.lock

@@ -2,7 +2,7 @@
   "lockfileVersion": 1,
   "workspaces": {
     "": {
-      "name": "@coder/cmux",
+      "name": "mux",
       "dependencies": {
         "@ai-sdk/anthropic": "^2.0.29",
         "@ai-sdk/openai": "^2.0.52",

package.json

@@ -1,11 +1,11 @@
 {
-  "name": "@coder/cmux",
+  "name": "mux",
   "version": "0.5.1",
   "description": "cmux - coder multiplexer",
   "author": "Coder",
   "main": "dist/main.js",
   "bin": {
-    "cmux": "dist/main.js"
+    "mux": "dist/main.js"
   },
   "license": "AGPL-3.0-only",
   "repository": {