pi 扩展注册虚拟模型，Jev 分类器可跑脚本

Pi Changelog @PiChangelog原推发布于 2026.09.30

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Virtual models and classifiers: - Extensions register virtual models with pi.registerVirtualModel() and pick a physical model and thinking level per request; the footer shows the routed model and /session lists cost per physical model. - Every llama.cpp chat model now has a classifier model answered from next-token label probabilities; Jev classifiers can also be run from codemode scripts.