Add agent working directory to avoid Claude home trust bug

Claude doesn't trust ~ as a workspace even after marking it trusted
(anthropics/claude-code#13288), so create /home/dev/agent and set it
as the default WORKDIR.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bgrgicak

packages/docker/Dockerfile.claude

@@ -7,3 +7,9 @@ RUN curl -fsSL claude.ai/install.sh | bash -s 2.1.101
 RUN echo 'export PATH="$HOME/.local/bin:$PATH"' >> /home/dev/.bashrc
 
 ENV PATH="/home/dev/.local/bin:${PATH}"
+
+# Create a dedicated working directory for the agent.
+# Claude doesn't trust ~ as a workspace even after marking it trusted:
+# https://github.com/anthropics/claude-code/issues/13288
+RUN mkdir -p /home/dev/agent
+WORKDIR /home/dev/agent