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)

tools/test_asset_pipeline.py

@@ -0,0 +1,109 @@
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from PIL import Image
+
+import asset_pipeline
+
+
+class AssetPipelineTests(unittest.TestCase):
+    def setUp(self):
+        self.temp_dir = tempfile.TemporaryDirectory()
+        self.root = Path(self.temp_dir.name)
+
+    def tearDown(self):
+        self.temp_dir.cleanup()
+
+    def test_crop_uses_center_and_exact_dimensions(self):
+        source = self.root / "source.png"
+        output = self.root / "crop.png"
+        Image.new("RGB", (80, 60), (20, 40, 60)).save(source)
+
+        asset_pipeline.crop_image(source, output, 32, 24)
+
+        with Image.open(output) as image:
+            self.assertEqual(image.size, (32, 24))
+
+    def test_resize_contain_preserves_aspect_and_exact_canvas(self):
+        source = self.root / "source.png"
+        output = self.root / "resized.png"
+        Image.new("RGB", (80, 40), (20, 40, 60)).save(source)
+
+        asset_pipeline.resize_image(source, output, 64, 64, "contain")
+
+        with Image.open(output) as image:
+            self.assertEqual(image.size, (64, 64))
+            self.assertEqual(image.getpixel((32, 0)), (0, 0, 0, 0))
+
+    def test_texture_audit_accepts_valid_tile_and_rejects_bad_seams(self):
+        good = self.root / "good.png"
+        bad = self.root / "bad.png"
+        Image.new("RGB", (512, 512), (80, 80, 80)).save(good)
+        mismatch = Image.new("RGB", (512, 512), (80, 80, 80))
+        for y in range(512):
+            mismatch.putpixel((0, y), (255, 0, 0))
+        mismatch.save(bad)
+
+        self.assertEqual(asset_pipeline.audit_image(
+            good, "tile")["quality"], "good")
+        self.assertEqual(asset_pipeline.audit_image(
+            bad, "tile")["quality"], "bad")
+
+    def test_background_audit_rejects_small_image(self):
+        image_path = self.root / "small.png"
+        Image.new("RGB", (640, 360)).save(image_path)
+
+        result = asset_pipeline.audit_image(image_path, "background")
+
+        self.assertEqual(result["quality"], "bad")
+        self.assertTrue(
+            any("too small" in error for error in result["errors"]))
+
+    def test_grayscale_vignette_is_valid_without_alpha(self):
+        image_path = self.root / "vignette.png"
+        Image.new("L", (512, 512), 0).save(image_path)
+
+        self.assertEqual(asset_pipeline.audit_image(
+            image_path, "overlay")["quality"], "good")
+
+    def test_icon_audit_rejects_opaque_rgba_images(self):
+        image_path = self.root / "opaque_icon.png"
+        Image.new("RGBA", (64, 64), (255, 255, 255, 255)).save(image_path)
+
+        result = asset_pipeline.audit_image(image_path, "icon")
+
+        self.assertEqual(result["quality"], "bad")
+        self.assertTrue(any("transparency required" in error
+                            for error in result["errors"]))
+
+    def test_generation_reuses_existing_backend_and_targets_role_dimensions(self):
+        output = self.root / "background.png"
+        args = type("Args", (), {
+            "prompt": "Hollywood at night", "role": "background", "output": str(output),
+            "width": 1920, "height": 1080, "transparent": None,
+            "model": "test-model", "request_size": 2048,
+        })()
+        generated = Image.new("RGB", (256, 256), (20, 40, 60))
+
+        with patch.object(asset_pipeline.generate_textures, "generate_image",
+                          return_value=generated) as backend:
+            asset_pipeline._generate(args)
+
+        self.assertIn("Hollywood at night", backend.call_args.args[0])
+        self.assertIn("wide 16:9", backend.call_args.args[0])
+        with Image.open(output) as image:
+            self.assertEqual(image.size, (1920, 1080))
+
+    def test_role_inference_uses_game_asset_paths(self):
+        self.assertEqual(asset_pipeline.infer_role(
+            Path("assets/textures/icons/wand.png")), "icon")
+        self.assertEqual(asset_pipeline.infer_role(
+            Path("assets/textures/cards/ticket.png")), "card")
+        self.assertEqual(asset_pipeline.infer_role(
+            Path("assets/textures/skyline.png")), "backdrop")
+
+
+if __name__ == "__main__":
+    unittest.main()