Come strutturare un bus condiviso per sistemi multi-agente

[~600-1200 word guide in voce Giovanni about shared bus file architecture for multi-agent systems, covering: the problem of multiple agents writing to a shared file, the incident del 12 giu 2026 relativo a n8n, the sezione-propria rule, 4-step implementation (read→parse→edit-own-section→write-full), the SHA check protection on GitHub API, and how to verify integrity with grep count]