openspace-mcp-upstream-repo-bloat-no-dockerignore

The openspace-mcp repo ships with 64MB of dead-weight: assets/ (53MB demo GIFs), gdpval_bench/ (8.2MB benchmarks), showcase/ (3MB examples). There is no .dockerignore, so COPY . . in the Dockerfile bakes all 64MB into every image, inflating the container to 632MB. Adding a .dockerignore excluding these directories will reduce image size significantly with zero runtime impact.