## Why

Current Umami event payloads for CTA clicks and summary modal interactions include only `article_id`, which makes analysis harder when reviewing dashboards and raw events. Adding human-readable article context improves analyst speed and reduces lookup friction.

## What Changes

- Add `article_title` to CTA-click event payloads so click analytics can be understood without cross-referencing IDs.
- Add `article_title` to summary modal open/close event payloads in addition to existing `article_id` context.
- Keep existing event names and current fields intact for backward compatibility.

## Capabilities

### New Capabilities
- None.

### Modified Capabilities
- `hero-display`: Update analytics tracking requirement so CTA click events include both `article_id` and `article_title`.
- `summary-analytics-tagging`: Update modal open/close analytics requirements so payload includes `article_title` with existing article context identifier.

## Impact

- **Frontend analytics wiring:** `frontend/index.html` event payload construction for hero/feed CTA clicks and summary modal open/close events.
- **Analytics consumers:** Umami dashboards and downstream event analysis gain readable article context while preserving existing identifiers.
