v6: Force full rebuild - CPU fix with object.__setattr__ to bypass pydantic

Dockerfile

@@ -16,8 +16,8 @@ RUN pip install --no-cache-dir git+https://github.com/facebookresearch/tribev2.g
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Cache-bust: v4 (start+timeline Word fields fix)
-LABEL version="4"
+# Cache-bust: v6 (CPU fix: object.__setattr__ to bypass pydantic immutability)
+LABEL version="6"
 
 # Copy app
 COPY app.py .