fix(opencode): serialize config bun installs (#17342)

packages/opencode/src/config/config.ts

@@ -37,6 +37,7 @@ import { Account } from "@/account"
 import { ConfigPaths } from "./paths"
 import { Filesystem } from "@/util/filesystem"
 import { Process } from "@/util/process"
+import { Lock } from "@/util/lock"
 
 export namespace Config {
   const ModelId = z.string().meta({ $ref: "https://models.dev/model-schema.json#/$defs/Model" })
@@ -289,6 +290,7 @@ export namespace Config {
 
     // Install any additional dependencies defined in the package.json
     // This allows local plugins and custom tools to use external packages
+    using _ = await Lock.write("bun-install")
     await BunProc.run(
       [
         "install",