Add screenshots to marketing example READMEs

Insert thumbnail galleries linking to full-size images hosted on
GitHub Pages for budget-allocator, cohort-heatmap, customer-segmentation,
scenario-modeler, and system-monitor server examples.

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Jonathan Hefner 2025-12-05 15:37:25 -06:00
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A demo MCP App that displays cohort retention data as an interactive heatmap, showing customer retention over time by signup month.
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/01-initial-view.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/01-initial-view.png" alt="Initial view" width="100%"></a></td>
<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/02-hover-state.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/02-hover-state.png" alt="Hover state" width="100%"></a></td>
<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/03-low-retention-hover.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/03-low-retention-hover.png" alt="Low retention hover" width="100%"></a></td>
</tr>
</table>
## Features
- **Cohort Retention Heatmap**: Color-coded grid showing retention percentages across cohorts and time periods