Fix publish_release.sh to upload installer + AppImage; document host REQUIRE_SIGNIN_VIEW

- Script uploaded only the three portable binaries; v0.2.1 release was
  missing step-line-setup-0.2.1.exe and the AppImage. Now uploads the full
  set (extras when present), reuses existing releases (adds missing assets),
  and falls back to ~/.git-credentials basic auth when GITEA_TOKEN is unset
- Back-filled both missing assets onto the live v0.2.1 release via API
  (release now carries all 5 artifacts)
- TODO/RELEASING/MEMORY document the findings and the host admin steps for
  anonymous downloads ([service] REQUIRE_SIGNIN_VIEW)

README.md

@@ -137,10 +137,42 @@ The architecture maps onto Godot 4 nodes, scenes, and custom resources as descri
 - **NPC behavior:** Custom lightweight finite state machines driven by `NpcProfile` resources
 - **UI and audio:** Godot `Control` nodes, themes, audio buses, and `AudioStreamPlayer` nodes
 - **Art assets:** authored PNGs in `assets/textures/` (≤1024px, power-of-two) produced by `tools/generate_textures.py` and imported by Godot; structural geometry stays procedural (`WorldBuilder`). The same script can generate textures through the OpenRouter image API (`--ai`, requires `OPENROUTER_API_KEY`).
+- **Asset tooling:** `tools/asset_pipeline.py` reuses the OpenRouter generator for role-aware assets and provides crop, resize, and image-audit commands.
 - **Testing:** GUT (Godot Unit Test) in headless mode
 - **Source control:** git on a Gitea host with Gitea Actions (`.gitea/workflows/build.yml`) for headless tests and desktop release builds
 - **Targets:** Windows, Linux, and macOS desktop first; web later
 
+### Image Asset Tools
+
+Install the Pillow dependency used by the existing texture generator and the asset tools:
+
+```bash
+python3 -m pip install -r requirements-tools.txt
+```
+
+Generate a role-sized image (generation requires `OPENROUTER_API_KEY`):
+
+```bash
+python3 tools/asset_pipeline.py generate --prompt "weathered red brick" --role tile --output assets/textures/brick_extra.png
+```
+
+Crop uses the image center by default; `--x` and `--y` select an explicit crop origin. Resize defaults to aspect-preserving `contain`; use `--fit cover` to crop or `--fit stretch` to distort to the exact dimensions.
+
+```bash
+python3 tools/asset_pipeline.py crop assets/textures/source.png assets/textures/crop.png --width 256 --height 128
+python3 tools/asset_pipeline.py resize assets/textures/source.png assets/images/backgrounds/scene.png --width 1920 --height 1080 --fit cover
+```
+
+Audit accepts image files or directories. `--role auto` infers common roles from paths and filenames; explicit roles include `tile`, `texture`, `icon`, `card`, `banner`, `backdrop`, `background`, `overlay`, and `app_icon`.
+
+```bash
+python3 tools/asset_pipeline.py audit assets/textures
+python3 tools/asset_pipeline.py audit assets/images/backgrounds --role background --json
+python3 -m unittest discover -s tools -p 'test_*.py'
+```
+
+The audit classifies measurable fit issues as `good` or `bad` based on role-specific dimensions, aspect ratio, alpha requirements, and tile-edge continuity. It lists perspective/projection as a visual review item because image semantics cannot be judged reliably by these deterministic checks.
+
 ### Setup
 
 1. Download the Godot 4.3 editor (official build) and put `godot` on your PATH.