For a small set of notes, an agent over files works fine. The difference here is that the house is stored as rooms, devices, cables, connections, and dates, not just as summaries. That makes questions like "which cables leave this panel and where do they end?" or "which appliances in the utility room are older than 10 years?" much more reliable.

With files or transcripts, the model has to reconstruct that structure from prose every time, and a fully documented house quickly runs into context-window limits. Here it makes small, focused queries that return just the slice it needs.

Late here in Austria. Happy to follow up tomorrow.