# Phase 10.9.2 — Revenue Chart Rendering & Executive UX Closure

## Root cause
The Revenue view called `window.renderBarCompareChart(...)`, but the main layout did not load `public/assets/js/charts.js`. The browser therefore raised a ReferenceError and left five large blank chart canvases.

## Changes
- Load the internal chart runtime with a versioned deferred script.
- Make chart rendering report success/failure explicitly instead of silently swallowing errors.
- Add user-facing empty and graceful error states.
- Replace technical Revenue header copy with executive-facing language.
- Replace generic chart-reading instructions with data-driven executive insight.
- Add a live structural QA endpoint and standalone actual browser render gate.

## Protected contracts
- No Oracle SQL changed.
- No revenue calculation changed.
- No legacy parity rule changed.
- No write operation added.

## Acceptance
- Five Revenue chart payloads are available.
- Five canvases are actually rendered by a browser runtime.
- Browser gate returns PASS with rendered=5 and failed=0.
- Revenue parity remains PASS.