Enhance documentation for template signature and workspace structure, adding details on template settings and generated files
Enhance documentation for rendering and workspace specifications, adding details on resolution, metadata, and template settings
Split the specification into pages One 1225-line document became eleven, around the four foundations: workspace, project, render, preview. Preview is written rather than moved — it had no heading at all, existing as five fragments a thousand lines apart. Blocks moved verbatim by line range, with an assertion that every source line is claimed exactly once. Section numbers dropped, which also disposes of the two headings both numbered 7.5.3. Four API names left stale by the 0.6.0 renames are corrected.