Initial scaffold: base agent container image

Dockerfile

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+FROM git.unkin.net/unkin/almalinux9-base:latest
+
+RUN dnf install -y \
+        git \
+        git-lfs \
+        jq \
+        curl \
+        claude-code \
+    && dnf clean all
+
+RUN useradd -m -s /bin/bash agent
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+USER agent
+WORKDIR /home/agent
+
+ENTRYPOINT ["/entrypoint.sh"]