6778c338d42afa7437b302d0ff9f92389cf1f4ee
Document the features the main merge shipped: `create m:n relationship` (relationships ref + build-the-library note), the `--demo` teaching flag (command-line-options), the Ctrl-O schema sidebar (output-pane, now .mdx to embed the new cast), and horizontal/two-row input (assistive-editor).
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