The fastest-growing open-source repo in AI right now is a memory plugin. claude-mem hit ~50K GitHub stars because it solved a problem Anthropic hadn't shipped yet: persistent context across Claude Code sessions. One install, and every decision you made, every bug you fixed, every architectural choice from Tuesday's session is waiting for you Wednesday morning. The "95% less tokens" claim is real but requires context. Claude Code's context window is 200K tokens (1M on Opus). When you hit ~95%…