chore: establish learning module baseline

OpenMAIC/packages/@openmaic/generation/snippets/slide-image-instructions.md

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+### ImageElement
+
+```json
+{
+  "id": "image_001",
+  "type": "image",
+  "left": 100,
+  "top": 150,
+  "width": 400,
+  "height": 300,
+  "src": "img_1",
+  "fixedRatio": true
+}
+```
+
+**Required Fields**: `id`, `type`, `left`, `top`, `width`, `height`, `src` (source image ID like "img_1"), `fixedRatio` (always true)
+
+**Source Image Sizing Rules (keep original aspect ratio)**:
+
+- `src` must be an image ID from the assigned media list (for example, "img_1"). Do not use URLs or invented IDs
+- If no suitable source image exists, do not create image elements; use text and shapes only
+- When dimensions are provided (for example, "img_1: 884x424, ratio 2.08"):
+  - Choose a width based on layout needs, typically 300-500px
+  - Calculate `height = width / aspect_ratio`
+  - Example: ratio 2.08, width 400 -> height = 400 / 2.08 ~= 192
+- When dimensions are not provided, use 4:3 default (width:height ~= 1.33)
+- Ensure the image stays within canvas margins (50px from each edge)