poe: use extends format for gpt-5.5

Address PR review comment to use extends format and inherit from
openai/gpt-5.5 base model.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: fhennerkes

providers/poe/models/openai/gpt-5.5.toml

@@ -1,11 +1,16 @@
-name = "GPT-5.5"
 release_date = "2026-04-08"
 last_updated = "2026-04-08"
-attachment = true
-reasoning = true
-temperature = false
-open_weights = false
-tool_call = true
+
+[extends]
+from = "openai/gpt-5.5"
+omit = [
+  "family",
+  "knowledge",
+  "structured_output",
+  "cost.context_over_200k",
+  "limit.input",
+  "experimental",
+]
 
 [cost]
 input = 4.5455