Pin transformers <4.52 and unsloth_zoo==2025.11.1 for API compat

Dockerfile

@@ -37,7 +37,7 @@ COPY --chown=user requirements-training.txt .
 RUN pip install --no-cache-dir -r requirements-training.txt
 
 # 4. Unsloth --no-deps (avoids torchao>=0.13 conflict)
-RUN pip install --no-cache-dir --no-deps unsloth==2025.11.1 unsloth_zoo
+RUN pip install --no-cache-dir --no-deps unsloth==2025.11.1 unsloth_zoo==2025.11.1
 
 # 5. Remove torchao if pulled in (incompatible with torch 2.6, crashes transformers)
 RUN pip uninstall -y torchao 2>/dev/null; true

requirements-training.txt

@@ -1,5 +1,5 @@
 # Training deps (torch, unsloth installed separately in Dockerfile)
-transformers>=4.51.3,<5.0
+transformers>=4.46.0,<4.52
 trl>=0.12.0,<0.16
 peft>=0.13.0
 accelerate>=1.0.0