Add three-up evidence boards for El Capitan and Joke Shop

docs/screens/boards/README.md

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+# Three-up boards: photo | concept | capture
+
+Each strip lines up the three image sources for one venue state so the evidence
+chain stays visible: the licensed real photo is the **evidence**, the generated
+frame is the **proposal** (geometry anchored on the photo; see the
+[concepts board](../concepts/README.md) and each frame's `.refgen.json`), and
+the game capture is the **proof** of the current build. Where the concept and
+the photo disagree, the photo wins for shape; the capture shows the gap the
+facade-realism work has to close.
+
+Composed with `tools/three_up.py compose` (labels baked in; the photo panel's
+attribution lives in the caption and the [refs sidecars](../refs/README.md)).
+
+| Board | Caption |
+| --- | --- |
+| ![three-up board: elcapitan day](elcapitan-day-board.jpg) | El Capitan facade, day. Photo: [CC BY 2.0, woo, 2009](https://commons.wikimedia.org/wiki/File:El_Capitan_Theater_frontal_fachade-The_Masonic_Temple.jpg) via `refs/hollywood`. Concept: photo-anchored generation. Capture: current build. |
+| ![three-up board: elcapitan night](elcapitan-night-board.jpg) | El Capitan block, night. Photo: CC BY-SA 3.0 (reviewed; redistribution only, no derived assets) via `refs/hollywood`. Concept: photo-anchored night restage. Capture: current build. |
+| ![three-up board: jokeshop day](jokeshop-day-board.jpg) | Joke Shop frontage, day. Photo: public domain (2006) via `refs/joke-shop`. Concept: generated. Capture: current build. |