build: copy README.md into Docker build context before uv sync

[nnkogift]

Summary

Fixes the Docker build failure caused by README.md missing from the build context during uv sync --frozen --no-dev.

Closes #134

What was wrong

pyproject.toml declares README.md via the readme field. When uv resolves the package during uv sync, it reads pyproject.toml and expects README.md to be present. The Dockerfile was not copying README.md before the sync step, causing the build to fail.

Changes

• Dockerfile — added COPY README.md . before the uv sync --frozen --no-dev step

Before

COPY pyproject.toml uv.lock ./
RUN uv sync --frozen --no-dev

After

COPY pyproject.toml uv.lock README.md ./
RUN uv sync --frozen --no-dev

Testing

Confirmed the Docker build completes successfully after applying this change.