Keep the current tool-call bridge contract stable while extracting shared
execution setup and tightening Anthropic forwarding regressions.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Move tool bridge and responses adapter helpers out of app.main so the main entrypoint can shrink without changing route orchestration behavior.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>