Panel member token usage was tracked but discarded, so the cost badge only
ever showed the worker's tokens — misleading for MoA where the real cost is
roughly rounds x agents. Collect each member's usage and add it to the badge.
Each member fills its own TokenUsage in parallel (Anthropic loop via the
existing memberUsage, CLI via the now-captured CliChatResult return value;
OpenAI members stay null, nachruestbar). RunPanel sums them after the
Task.WhenAll barrier — single-threaded, so no lock or Interlocked needed —
across all MoA rounds and emits a panel_usage SSE event before panel_done.
The frontend adds those tokens onto the worker totals in the done handler so
the badge reflects the full chain cost.
- SseHelper: add TokenUsage.Add()
- AnthropicService.Panel.cs: PanelMemberResult.Usage, accumulate per round
after the barrier, emit panel_usage; RunPanelMemberViaCli returns usage
- chat.js: _panelUsage state, panel_usage case, add to worker tokens on done,
reset on stream start
- TODO.md: check off the member-token item
v1 limit: live badge only — FinalizeChain still persists worker tokens, so a
reload shows worker-only cost.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
