Sking image-to-Minecraft-skin pipeline (AGPL-3.0)

Two-stage reproduction of EntropyDrop's open image-to-skin path.

stage 1 FLUX.2 [klein] 4B Base + sking_v73_flux_4b_000027000 LoRA
stage 2 EntropyDrop SKING_DDJ_v104 (BiRefNet foreground + Dense UV Parser)

Stage 2 runs in-process via runpy rather than subprocess so it works on
ZeroGPU, where child processes get no CUDA context. Dependency pins are
deviated from the bundle's tested_environments.json in three places to keep
the resolver satisfiable alongside diffusers==0.40.0; see DEPLOY.md.

app.py

@@ -328,7 +328,14 @@ Not affiliated with or endorsed by EntropyDrop, Mojang or Microsoft.
 Uploads are processed in memory and are not stored or used for training.
 """
 
-with gr.Blocks(title="Sking — Image to Minecraft Skin") as demo:
+try:
+    _blocks_ctx = gr.Blocks(
+        title="Sking — Image to Minecraft Skin", theme=gr.themes.Soft(), css=_CSS
+    )
+except TypeError:
+    _blocks_ctx = gr.Blocks(title="Sking — Image to Minecraft Skin")
+
+with _blocks_ctx as demo:
     gr.Markdown(
         """
         # Sking · image → Minecraft skin
@@ -430,21 +437,38 @@ print(f"[sking] spaces.GPU resolved to {gpu(1)!r}", flush=True)
 
 
 def _launch() -> None:
-    """Bind 7860 immediately; the ~19 GB download continues in the background."""
+    """Bind 7860 immediately; the ~19 GB download continues in the background.
+
+    `spaces` monkeypatches `gr.Blocks.launch` (spaces/zero/gradio.py) and simply
+    forwards *args/**kwargs, so a kwarg Gradio 6.27 dropped -- `show_api` -- or
+    one it relocated -- `theme`/`css` -- becomes a fatal TypeError at startup.
+    Walk from richest to the bare minimum instead of guessing the signature;
+    every rejected attempt fails before binding, so retrying is safe.
+    """
     print("[sking] calling demo.launch()", flush=True)
-    common = dict(server_name="0.0.0.0", server_port=7860, show_api=False)
     try:
         demo.queue(default_concurrency_limit=1)
     except TypeError:
-        # kwarg renamed/removed across Gradio majors; default queueing is fine.
-        demo.queue()
-    try:
-        # Gradio 6 moved css/theme from the Blocks constructor to launch().
-        demo.launch(theme=gr.themes.Soft(), css=_CSS, **common)
-    except TypeError:
-        # Gradio <=5 still takes them on Blocks / rejects them on launch().
-        demo.launch(**common)
-    print("[sking] demo.launch() returned", flush=True)
+        demo.queue()          # kwarg renamed/removed across Gradio majors
+
+    base = dict(server_name="0.0.0.0", server_port=7860)
+    attempts = [
+        {**base, "show_api": False, "theme": gr.themes.Soft(), "css": _CSS},
+        {**base, "theme": gr.themes.Soft(), "css": _CSS},
+        {**base, "show_api": False},
+        dict(base),
+    ]
+    last = None
+    for kwargs in attempts:
+        try:
+            demo.launch(**kwargs)
+            print(f"[sking] demo.launch() returned (accepted "
+                  f"{sorted(kwargs)})", flush=True)
+            return
+        except TypeError as exc:
+            last = exc
+            print(f"[sking] launch rejected {sorted(kwargs)}: {exc}", flush=True)
+    raise last
 
 
 # Deliberately NOT guarded by `if __name__ == "__main__"`: launching