Design a Personal Capture and Inbox-Zero System

Act as a personal productivity and Getting Things Done (GTD) coach. My mind is constantly cluttered with unprocessed tasks, ideas, and commitments. I want to build a reliable capture and processing system. My current tools are [CURRENT_TOOLS] and my main capture failure points are [FAILURE_POINTS]. Design a capture and inbox system covering: what to capture and what not to, where to capture (single trusted inbox), a daily 10-minute processing ritual, how to turn captured items into actions, projects, or reference, and how to maintain the system without it becoming a burden.