Revert "pregate: gstack's bun run test lane runs its runner-skipped files with per_file"

This reverts commit fafbae5b9b.

.gstack/pregate.json

@@ -28,7 +28,7 @@
     "skipped": "bun --no-env-file --config=/dev/null -e 'import { isPaidTestFile } from \"./test/helpers/paid-test-set.ts\"; import * as fs from \"node:fs\"; for (const f of fs.readFileSync(process.env.PREGATE_FILES_FILE, \"utf8\").split(/\\r?\\n/)) if (f && isPaidTestFile(f)) console.log(f);'"
   },
   "ship_lanes_from": {
-    "bun run test": { "profiles": ["ci-reuse/free-tests"], "inventory": "bun --no-env-file --config=/dev/null run scripts/test-free-shards.ts --list | sed -n 's/^  //p'", "per_file": "bun test --timeout=30000 {files}" }
+    "bun run test": { "profiles": ["ci-reuse/free-tests"], "inventory": "bun --no-env-file --config=/dev/null run scripts/test-free-shards.ts --list | sed -n 's/^  //p'" }
   },
   "warn": [],
   "strays": { "allow": ["modules/loadouts.json", "modules/loadouts.schema.json"] }