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.

MEMORY.md

@@ -37,6 +37,10 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   material (`baseColorTexture` + `metallicRoughnessTexture`, NEAREST sampling). Colours are sRGB in
   the texture, so the old `srgb_to_linear`/`_linear_rgba` helpers were removed. `audit_glb` fails
   if a prop is not exactly one material or misses TEXCOORD_0/images.
+- **Mockups complete (v0.3.2):** `docs/screens/designs/` holds AI references for all 19
+  catalogue screens. Only the six staged captures (01–06) are compared/judged; the other 13
+  have no `capture`, so adding staged captures for the wand panel, timeline and escalation HUD
+  would extend automated visual checks. `generate` now calls `_load_env_file()`.
 - **Backlog complete:** every planned TODO section is done and moved to `DONE.md`; `TODO.md`
   now only lists optional future ideas (live 3D replay, NPC LOD, more venues, real audio, prop
   atlas, AI mockups for the new catalogue entries, image-to-mesh props). GUT was consciously not