Gemma 4 Challenge: Build With Gemma 4 Submission This is a submission for the Gemma 4 Challenge: Build with Gemma 4 What I Built Reiseki (霊石) is a local AI assistant. It uses Gemma 4 via Ollama to handle real tasks: reading and writing files, generating Word and PDF documents, lightweight data analysis, managing reminders, and remembering context across sessions. The goal was to build something usable by people who have never touched a terminal. Reiseki ships as a Windows installer — after installing Ollama and a model, you pick a workspace folder, and the agent is ready. No Python environment, no config files, no command line. Under the hood it runs a ReAct loop (Reason → Act → Observe) with 15+ tools, persistent conversation history in SQLite, a live tool trace in the UI, and a LAN access toggle for smartphone use via QR code. Code & Demo The full source code and a video are available on GitHub: github.com/Flo1632/reiseki The Windows installer ( ReisekiSetup.exe ) is available on the Releases page.…