Improve structure and evaluation clarity of Gambit Digest entries

### Description

To enhance the readability, analytical value, and shareability of each digest entry, consider the following structural improvements for future issues of **Gambit Digest**:

#### Analytical Suggestions

* Include a brief **evaluation shift summary** for each line
*e.g.*: `"+1.3 → -2.1 after 8...hxg6?"`
This helps readers immediately gauge the volatility and tactical swing.

* Add a **“Best defended by...”** line
Suggest the engine-preferred move and resulting eval if Black/White plays accurately, useful for contrasting chaos with best play.

#### Analysis Summary Block

Create a small structured section under each line, such as:

```markdown
### Summary
- Motif: Center destabilization
- Volatility: 7.1 / 10
- Deviation Depth: Move 5
- Evaluation Swing: +0.6 → -3.2
- Best Defended By: 8... Be6
```

#### Visual Improvements (Optional)

* Embed **Lichess interactive boards** (e.g., [Lichess Studies](https://lichess.org/study) for each main line.
* Consider using a **PGN viewer embed** for inline move navigation (e.g. [pgn-viewer-js](https://github.com/mliebelt/PgnViewerJS) or GitHub-compatible markdown renderers).
* Optionally, use FEN thumbnails or clickable diagrams for key turning points.

_This issue tracks long-term formatting and presentation improvements to **Gambit Digest** publications. Feel free to update this thread with additional formatting proposals or implementation notes._

Revise las entradas existentes de Gambit Digest en el repositorio para comprender el formato actual. El trabajo implica actualizar la generación de contenido o la lógica de plantillas, probablemente en scripts de Python que producen el markdown. Busque cualquier script existente en el repositorio que maneje la creación de resúmenes. El objetivo es modificar la salida para incluir las nuevas secciones estructuradas, como resúmenes de cambios de evaluación y bloques de análisis, y opcionalmente integrar con Lichess o visores de PGN.

Escrito por el modelo de indexación a partir del texto del issue.