Distillation

Date: Sep 16, 2026

• 🔴 (14:05) User stated: “Always accumulate into the internal state for postResponse.”
• 🟡 (14:05) Code diff added lifecycle tracking via ReadonlyMap<number, TextPartLifecycle> and handling for "reasoning_text" / "response.reasoning_text.delta" events.
• 🟡 (14:05) Code diff added sparse-coordinate validation through assertSparseCoordinates(event, parsed), tracked maximumOutputIndex.value, and handled unresolved versus visible tool indices during streamed response processing.
• 🟡 (14:05) Test additions inspect finalized materialized items through finalizeSpy.mock.calls, validate expected errors, exercise onRecall: async () => ({ anchorText: "", resultText: "" }), and assert output contains PUBLIC_GATEWAY_ERROR.