- Member/lead nodes show robohash avatar image clipped to circle inside hex
- Async image loading with cache (fallback to first letter while loading)
- avatarUrl field added to GraphNode type + adapter passes agentAvatarUrl()
- Column headers now centered over pill center (was offset by half pill width)
1. Member spawn animation: rotating dashed ring for 'spawning' status,
pulsing hex outline for 'waiting' status
2. Edge flash: active edges pulse brighter (0.1-0.5 alpha) with glow
shadow when particles travel along them
3. Smooth task positioning: tasks LERP to target position (0.15 factor)
instead of teleporting when kanban column changes
4. Comment flight particles: when a member adds a comment to a task,
a purple particle with speech bubble flies from member to task node