v0.3.0: game-window picker + NCC recognition + artifacts + ?-merged

- window_capture.py: enumerate top-level windows (pygetwindow) and
  capture a specific one via PrintWindow PW_RENDERFULLCONTENT (works
  on non-focused windows). Linux falls back to mss region grab.
- recognizer.py: replace MAE matcher with NCC over numpy vectors.
  Each rotatable slab generates 4 templates (0/90/180/270). Adds 248
  artifact templates and an empty-cell heuristic (low mean/std-dev).
  Cells below confidence floor are tagged "unknown" — likely merged
  "?" boxes.
- gui.py: new ScreenshotFrame with [게임 창 선택] button → window
  picker dialog → bbox crop → recognize → editable preview grid with
  per-cell CellEditor that handles slab / artifact / merged(?) / empty.
  Merged cells let user pick which two slabs got combined + a level.
- artifacts.py + bundled _artifacts.json (248 entries from
  WhiteDog1004/sephiria) for matching and rendering.
- renderer.py: factored CDN fetch into _fetch_image; added
  fetch_artifact_image().
- requirements.txt: + numpy, pygetwindow (Win), pywin32 (Win).
- docker-build-cmd.sh: upgrade PyInstaller to 5.x inside cdrx
  container so numpy DLL manifest reads work.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

sephiria_inv/renderer.py

@@ -62,22 +62,18 @@ def _local_path(slab_image: str) -> str:
     return os.path.join(CACHE_DIR, os.path.basename(slab_image))
 
 
-def fetch_slab_image(slab_image: str, timeout: float = 10.0) -> Optional[Image.Image]:
-    """Return a PIL Image for the slab, downloading + caching if needed.
-
-    Returns None if download fails — caller draws a placeholder.
-    """
+def _fetch_image(rel_or_url: str, timeout: float = 10.0) -> Optional[Image.Image]:
+    """Fetch an image from the CDN. Accepts a full URL or a 'slabs/foo.png' path."""
     _ensure_cache_dir()
-    path = _local_path(slab_image)
+    path = _local_path(rel_or_url)
     if os.path.exists(path):
         try:
             return Image.open(path).convert("RGBA")
         except Exception:
             pass
     try:
-        import requests  # lazy import; allow renderer use without network if cached
-
-        url = f"{CDN_BASE}/{slab_image.lstrip('/')}"
+        import requests
+        url = rel_or_url if rel_or_url.startswith("http") else f"{CDN_BASE}/{rel_or_url.lstrip('/')}"
         r = requests.get(url, timeout=timeout)
         if r.status_code != 200:
             return None
@@ -88,6 +84,16 @@ def fetch_slab_image(slab_image: str, timeout: float = 10.0) -> Optional[Image.I
         return None
 
 
+def fetch_slab_image(slab_image: str, timeout: float = 10.0) -> Optional[Image.Image]:
+    """Return a PIL Image for the slab. Caches under CACHE_DIR."""
+    return _fetch_image(slab_image, timeout=timeout)
+
+
+def fetch_artifact_image(url: str, timeout: float = 10.0) -> Optional[Image.Image]:
+    """Return a PIL Image for an artifact (full URL from artifacts.json)."""
+    return _fetch_image(url, timeout=timeout)
+
+
 # ---------------------------------------------------------------------------
 # Font
 # ---------------------------------------------------------------------------