Ship reasoned-route spelled-out-number guard fix

UI v3: fintech-direction design pass (5 grafts), waterfall historical-mode fix, explain-strip placement + shared hook, palette contrast fix

Ship App v2 + Tier-2 sandbox (5-tab UI, analyze_data, contract-first API)

Stretch: Tier-3 doc retrieval (query_model_docs) + MCP server; ship wiki/knowledge/skill-scripts in image

Day 4: runtime file set (engine, agent, API, UI source, panel, DFAST scenarios, model cache, exhibits)