context-engineering 4 In my rerun, Headroom saved 0 tokens on its GSM8K eval prompts Oct 3, 2026 TypeSafe's routing verdict hinges on the price ratio Sep 27, 2026 Qwen3.6-Plus Preserves Only Reasoning the Client Replays Apr 2, 2026 OpenContext: Stable IDs Point to Current Files, Not Snapshots Jan 17, 2026