Add AI mockups for the seven remaining catalogue screens

The design catalogue grew to 19 screens, but only the original twelve had an AI
reference; the rest still showed "design -" in `list`. Generated the missing set
so every screen can be reviewed against an intended look:

- wand screening (metal-detected panel with carried items and allow/deny)
- Joke Shop queue, TV Studio arrival, crowd panic, responder arrival
- body-camera timeline, escalation HUD

`generate` now loads `.env` the same way `judge` does, so `--ai` no longer needs
the API key exported by hand. Each reference is 1280x720; the twelve existing
mockups were kept (no `--force`).

Verification: `list` reports 19 designs, Python tooling 53/53, headless suite
182/182, `compare` still 6 good / 0 bad on the captured screens. Version 0.3.2.

README.md

@@ -32,7 +32,7 @@ The central design goal is simple:
 > Downloads are public (no sign-in required) since the host's instance-wide
 > `REQUIRE_SIGNIN_VIEW` was disabled on 2026-10-31.
 >
-> **Latest: v0.3.1** — props draw with a single atlas material instead of one material per part.
+> **Latest: v0.3.2** — every screen in the design catalogue now has an AI reference mockup.
 > Releases are built automatically when a `vX.Y.Z` tag is pushed
 > (see [`docs/RELEASING.md`](docs/RELEASING.md)); manual builds use
 > `./tools/build_releases.sh`. Installer/AppImage packaging runs in the same pipeline
@@ -261,7 +261,9 @@ python3 tools/screen_designs.py judge --dry-run    # build requests, no network
 The catalogue covers 19 screens: the six README captures plus the start menu,
 pause overlay, settings, shift review, radial menu, emergency radio, wand
 screening, Joke Shop queue, TV Studio arrival, crowd panic, responder arrival,
-body-camera timeline, and the escalation HUD.
+body-camera timeline, and the escalation HUD. All 19 have an AI reference in
+`docs/screens/designs/`; the six screens with staged captures are also compared
+or judged against the running game.
 
 `compare` flags gross drift: wrong aspect ratio, undersized frame, near-blank
 frame, and large layout/palette/detail distance. It is a regression gate, not a