Add D3 (overview EXEC badge + real-vs-sim divergence chip + account rollup),
D4 (/paper/ibkr account-level view: total NAV + all positions/fills +
per-strategy breakdown), a UX & information-architecture section (3-level
progressive disclosure, one divergence signal rendered consistently), and a
strategy-tagged data model so a second executor is a new ROW, not a redesign.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>