*.md was excluding templates/docs from Docker context, so COPY and
go:embed could not see prelim_design.md at /app. Un-ignore those trees
and assert the smoke image can cat the official file.
Co-authored-by: Cursor <cursoragent@cursor.com>
App images have no templates/ checkout, so GetDocTemplate fell back to a two-section stub and prelim_design lost its real contract.
Co-authored-by: Cursor <cursoragent@cursor.com>