wave autoplan: lower the gemini plan-devex-review pin to its exact size after #3781's DX trim

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

test/fixtures/skill-md-size-allowlist.json

@@ -31,7 +31,7 @@
     "gbrain/gstack-plan-eng-review": 124972,
     "gemini/gstack-autoplan": 108899,
     "gemini/gstack-plan-design-review": 109210,
-    "gemini/gstack-plan-devex-review": 114248,
+    "gemini/gstack-plan-devex-review": 114247,
     "gemini/gstack-plan-eng-review": 143588,
     "gemini/gstack-review": 103679,
     "hermes/gstack-autoplan": 108751,