fix: apply sandboxjs patch during build instead of postinstall

Run patch-package in prebuild/pretest so the patched code gets bundled
by ncc. Remove postinstall script so end users don't need patch-package.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: buger

package.json

@@ -44,11 +44,10 @@
     "format": "prettier --write src tests",
     "format:check": "prettier --check src tests",
     "clean": "",
-    "prebuild": "npm run clean && node scripts/generate-config-schema.js",
-    "pretest": "node scripts/generate-config-schema.js && npm run build:cli",
+    "prebuild": "npm run clean && patch-package && node scripts/generate-config-schema.js",
+    "pretest": "patch-package && node scripts/generate-config-schema.js && npm run build:cli",
     "test:with-build": "npm run build:cli && jest",
     "test:yaml": "node dist/index.js test --progress compact",
-    "postinstall": "[ -f node_modules/.bin/patch-package ] && patch-package || true",
     "prepare": "husky",
     "pre-commit": "lint-staged",
     "deploy:site": "cd site && npx wrangler pages deploy . --project-name=visor-site --commit-dirty=true",