Bump to v0.2.1 (maintenance): CI now verifies the NSIS installer contents via 7z

- Add a 'Verify Windows installer contents' step (7z l shows Step Line.exe +
  uninstall.exe) so the TODO verification items are proven by CI output
- Rebuild 0.2.1 binaries (embedded PCK) and AppImage locally; smoke clean;
  57/57 tests

MEMORY.md

@@ -67,6 +67,12 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   default batch. Output is downscaled to ≤1024px. NOTE: seedream rejects sizes below
   3,686,400 px (1920×1920), so the script requests `GEN_SIZE=2048` and downscales — do not
   lower `GEN_SIZE` below 1920. Verified end-to-end 2026-10-31 (3 textures generated).
+  `AI_TEXTURES` now covers all 15 game textures (world surfaces, awning, skyline, vignette,
+  4 HUD icons, 5 access cards) with a `transparent` flag per entry. NOTE: seedream-4.5
+  ignores `background: transparent` and returns fully opaque images (alpha=255), so the
+  `ai/` icons/vignette/skyline are opaque — they are NOT drop-in replacements for the
+  authored transparent PNGs. Use a transparency-capable model (or post-process) if alpha
+  is needed.
 - Detailed graphics: textured facade/awning/skyline, humanoid NPC rigs + props + walk bob +
   attention head-turn, inspection artifact cards, mode icons, escalation vignette, body-cam
   overlay (REC + shift clock). Screenshot set regenerated (`docs/screenshots/`, day + night).