Add the licensed Joke Shop reference board

docs/screens/refs/joke-shop/README.md

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+# Joke Shop / Sunset Strip reference board
+
+Licensed photographs of the real Comedy Store block at 8433 Sunset Boulevard, used as evidence for
+the game's second venue: the low black hall, the deep signature canopy, the circular blade sign, the
+red curtain bays and the dry hillside that rises directly behind the roofline.
+
+Development reference only; not shipped with the game. Provenance and licences are in
+[`SIDECAR.md`](SIDECAR.md). Folder rules: [`../README.md`](../README.md). Generated art-direction
+frames: [`../../concepts/joke_shop/`](../../concepts/joke_shop/README.md).
+
+| Photo | What it is evidence for |
+| --- | --- |
+| ![The Comedy Store from across Sunset, hillside and houses behind the roof](comedy-store-hillside-canopy-day-pd-2006-12-29.jpg) | **Block and hillside.** The hall's height against the boulevard, the canopy depth from the street, and the dry slope with houses and palms rising behind the roofline. |
+| ![The Comedy Store frontage with palms and the wall sign](comedy-store-frontage-palms-day-pd-2006-12-29.jpg) | **Frontage rhythm.** Blade sign height and diameter, the flat black wall, palm placement, kerb setback and where the entrance sits in the run. |
+| ![Canopy fascia covered in white signatures with red curtains below](comedy-store-signature-band-day-wikimedia-2020-04-09.jpg) | **Canopy and curtain detail.** Signature density on the fascia, the white band width, the red curtain bays and the warm interior spill at dusk. |
+
+## Gaps to fill
+
+- A night photograph of the canopy, blade sign and red curtain wash (the current night evidence is
+  the generated concept frame and the game capture).
+- A closer view of the entrance recess and door hardware.
+- An across-street frame showing the neighbouring frontages on the south side of Sunset.
+- A hillside detail showing the house rooflines above the club.
+
+Add new files with the naming convention in [`../README.md`](../README.md) and list them in the
+sidecar in the same commit.