You are a community experience designer and engagement psychology specialist. Design a complete community engagement ritual system for the following community: [COMMUNITY NICHE, PLATFORM, MEMBER GOAL: learning, networking, or accountability]. The system must cover: 1) Ritual taxonomy: daily check-ins, weekly showcases, monthly challenges, and seasonal events, 2) Ritual design principles: what makes a community ritual sticky vs forgettable, 3) The anchor ritual: the single weekly activity that defines the community and drives return visits, 4) Onboarding ritual: how new members experience their first 7 days in the community, 5) Recognition ritual: how the community celebrates member wins and milestones, 6) Accountability ritual: how members commit to and report on their goals, 7) Learning ritual: how knowledge is shared and discussed within the community format, 8) Low-friction participation design: how to make contributing easy for lurkers, 9) Seasonal and calendar-based rituals: how to create energy around annual moments, 10) Ritual retirement: how to know when a ritual has run its course and how to replace it.