fix: order GPT-5.5 Pro below GPT-5.6 (newest-first within OpenAI)

GPT-5.5 Pro sat at order 20, above the GPT-5.6 entries, breaking the
newest-first grouping used elsewhere. Move it to 29.8 so the OpenAI block
reads 5.6 -> 5.5 -> 5.4 -> 5.3 -> 5.2.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

models/gpt-5-5-pro.json

@@ -4,7 +4,7 @@
   "harness": "ChatGPT Web",
   "effort": "Extended Pro",
   "artifactDir": "gpt-5-5-pro/chatgpt-web-extended-pro",
-  "order": 20,
+  "order": 29.8,
   "runs": {
     "mythos-craft": {
       "note": {