Pin simready-foundation to 805d2c5 (matches DGXC's working version)

Dockerfile

@@ -10,7 +10,6 @@
 # image so cold-start is fast — the per-validation cost is just the
 # dataset download + USD parsing, not pip resolution.
 
-# build-bust marker 1779850523
 FROM python:3.11-slim
 
 # Base build deps. usd-core ships wheels for x86_64 so we don't need
@@ -33,12 +32,20 @@ WORKDIR /home/${USER}/app
 COPY tools/hf_space/requirements.txt ./requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Foundation specs: the validator wants SIMREADY_FOUNDATIONS_PATH to
-# point at a checkout. Pinned tag avoids surprise spec churn between
-# Space builds. Bump the tag deliberately when foundation rules change.
+# Foundation specs: pinned to a specific commit so spec churn upstream
+# doesn't break the Space's compatibility with the pinned simready-
+# validate package. The validator's loader rejects features whose
+# requirement codes aren't registered, and the foundation repo's main
+# branch has moved ahead of what simready-validate 2026.4.x understands
+# — sticking to the 2026.04.0 release tag (commit 805d2c5) matches the
+# DGXC runner's working setup. Bump deliberately when both the spec
+# and the validator package are tested together.
 ENV SIMREADY_FOUNDATIONS_PATH=/opt/simready_foundations
-RUN git clone --depth 1 https://github.com/NVIDIA/simready-foundation \
+ENV SIMREADY_FOUNDATIONS_COMMIT=805d2c50179a9878c89b0f41baaa0ecafe47c3d7
+RUN git clone https://github.com/NVIDIA/simready-foundation \
         ${SIMREADY_FOUNDATIONS_PATH} \
+    && cd ${SIMREADY_FOUNDATIONS_PATH} \
+    && git checkout ${SIMREADY_FOUNDATIONS_COMMIT} \
     && chown -R ${USER}:${USER} ${SIMREADY_FOUNDATIONS_PATH}
 
 # Copy the bundled validator (the same code our DGXC runner uses) and