Workers AI rejects OpenAI content-part array shape; flatten text parts
to a plain string per message before sending.
Co-authored-by: Cursor <cursoragent@cursor.com>
Add config-driven stripUnsupportedParams helper and use it in the default and github executors. Removes the deprecated temperature param for claude-opus-4 models (Anthropic 400) and consolidates github's scattered capability checks into one rule table.
Fixes#1748
Co-Authored-By: fjia <fjia@suntekcorps.com>
Co-authored-by: Cursor <cursoragent@cursor.com>