4f004adefa
Previously, within a single tool-use turn, rate limit retries would accumulate across separate LLM calls. For example, if each of 3 tool calls hit a 429 and retried once, the counter would show '3/3' and fail even though each individual retry succeeded. Now the counter resets immediately when a successful (non-error) assistant message arrives, so each LLM call gets a fresh set of retries. Fixes #1019