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Backend: - Add player_sessions table (migration 004) for session tracking - Implement retention calculation queries (24h/48h/72h post-wipe) - Add /api/plugin/player-event endpoint for join/leave tracking - Add /api/analytics/retention endpoint with CSV export - Track unique players, session duration, new vs returning ratio Frontend: - Create PlayerRetentionView with ECharts retention curves - Add multi-wipe comparison (last 3/6/10/20 wipes) - Display summary metrics and detailed wipe table - Add /retention route to router Plugin: - Update CorrosionCompanion.cs to send player events to new endpoint - Track player join/leave with license_key authentication Enables data-driven wipe timing optimization by answering: "What percentage of players return 24h/48h/72h after a wipe?" Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>