- Preserve pending tool use IDs across message-level system reminders to maintain tool call and result alignment.
- Merge adjacent Gemini request contents for consecutive user and system reminder turns.
- Relax tool response reordering condition and preserve non-response parts in Antigravity executor.
- Align tool results and buffer pending system reminders in OpenAI translator.
Closes: #5354
- Refactor Gemini/OpenAI/Codex/Claude/Antigravity interaction and response translators to collect `parts`, `content`, `steps`, `tool_calls`, and `output` items in slices, then set each array once via `translatorcommon` helpers.
- Replace repeated incremental `sjson.SetRawBytes(..., ".-1", ...)` mutations with single-shot raw-array updates to avoid repeated rewrites.
- Keep existing step/content semantics while reducing ordering/overwrite risks when merging multi-fragment data (including thought/signature and web-search/function-call blocks).
- Added `is-compat` model metadata plumbing from config through executor and helpers, including hash computation.
- Introduced a compatibility-aware translation path (`TranslateRequestWithAPIKeyModelCompatibility`) and wired it into Claude/Gemini/Codex/Interactions request flows.
- Updated Claude message sanitization/translation behavior to keep empty-thinking compatibility blocks (including signatures) when `is-compat` is enabled, while keeping default behavior unchanged.
- Introduced API handlers and executor logic for Google Interactions
- Added request and response transformations for OpenAI and Claude Interactions.
- Integrated Gemini API with Interactions support.
- Updated tests to validate Interactions request parsing and error handling.
- Refactored translator logic for Interactions data flows.
