Draft: Add workflow mission wall product design

[AbigailDeng]

Summary

• Add Workflow Mission Wall product package with benchmark-backed direct-use component decision
• Add large-screen wireframe that removes the separate right-side queue and bottom feed areas
• Add data contract/MVP plan for reusing existing GraphCanvas, MemberPublishedRunsReplay, readmodels, and Run Inspector handoff
• Add static HTML prototype and 1920x1080 rendered PNG for review

Direct-use component decision

• MVP should directly reuse existing @xyflow/react / React Flow via GraphCanvas
• AntV X6 is an open-source fallback but would duplicate the current graph stack
• GoJS/yFiles are paid SDK options only if future diagram requirements exceed React Flow
• Full products such as Temporal UI, Kestra, Dify, n8n, Grafana, Langfuse, and LangSmith should be copied for IA patterns or linked for drilldown, not embedded as the wall

Validation

• bash tools/docs/lint.sh
• git diff --check for the new docs/prototype files
• rendered prototype PNG is 1920x1080

Notes

• Draft PR for product/design review only
• No application code, backend contracts, or CI changes included