Revisiting My Phone AI After Gemma 4: The Upgrade I Didn't Know I Needed

Two weeks ago, I built a RAG pipeline on my phone. Termux. Gemma 4 E2B. A Python script that took my lecture notes and turned them into a private AI tutor I could interrogate offline. It worked. It was slow. It was fragile. But it worked. Then Google dropped an entire family update, and I realized I'd been running the equivalent of a beta test. After digging through the architecture docs and benchmarks that have come out since the release, I revisited my original build to answer one question:...