docs: aseprite headless available on nh3-dev — pipeline verified pixel-identical

CLAUDE.md

@@ -102,6 +102,12 @@ Non-negotiable canon highlights (full rationale in CONCEPT.md):
   merge. Enforced on nh3-dev by a local `.git/hooks/pre-commit`
   (not versioned — recreate on fresh clones: refuse staged-new `.gd`
   without a tracked `.uid`).
+- **Aseprite headless on nh3-dev**: `~/bin/aseprite` (1.3.18.2,
+  operator-licensed source build; tree at `~/src/aseprite`, skia m124
+  at `~/deps/skia`). Sprite pipeline: `aseprite -b --script
+  tools/aseprite/gen_sprites.lua` from the repo root; the Pillow
+  previewer `tools/aseprite/preview.py` renders pixel-identical PNGs
+  from the same maps (verified 2026-08-14).
 - **Two-machine hygiene (Mac editor side):** pull BEFORE opening the
   editor after new commits land. If a pull ever refuses over generated
   sidecars anyway, they're safe to delete wholesale:

persistent-memory.md

@@ -50,6 +50,14 @@ _As of 2026-08-07 (post-falsifier):_
   side — likely the Aseprite/Retro Diffusion pixel pipeline from the
   advisor notes) and will loop this project in when ready. M2
   playtest verdict still pending; no repo work blocked on it.
+- `[2026-08-14]` **Aseprite 1.3.18.2 built from source on nh3-dev**
+  (operator-licensed) at `~/bin/aseprite`; headless gen_sprites.lua
+  run verified pixel-identical with preview.py (see CLAUDE.md Engine
+  notes). Operator bought Retro Diffusion but has the **Aseprite
+  extension** (dialog-GUI, not headless-drivable); awaiting his check
+  for an account API key (would unlock direct remote scripting) or
+  the extension file for interop inspection. Sprite work remains
+  `_ph` ideation — greybox stays art-free.
 
 ## Recent decisions