fix: use bun to run validate install in postbuild step

Author: Bharatram-altimate-ai

packages/opencode/package.json

@@ -8,7 +8,7 @@
   "scripts": {
     "typecheck": "tsgo --noEmit",
     "test": "bun test --timeout 30000",
-    "build": "bun run script/build.ts && ./bin/altimate-code validate install",
+    "build": "bun run script/build.ts && bun run --conditions=browser ./src/index.ts validate install",
     "dev": "bun run --conditions=browser ./src/index.ts",
     "db": "bun drizzle-kit"
   },