Open-Weight Models, Agent Memory, and Cursor's Customize Page

Three concrete signals today: Lenny tested GLM-5.2 as a cheaper Claude Opus replacement in real coding workflows and came away convinced; LangChain published a practical guide to building memory into agents that closes a real gap in the agent design playbook; and Cursor shipped a Customize page (v3.9) that consolidates plugins, MCPs, and skills into a single management surface — the first sign that Cursor is thinking seriously about configuration at scale.