Author active Workbench page previews in the top-level pages/ directory.
Nebula may also keep reference examples in examples/pages/, but those are
examples only and should not replace the canonical Workbench pages directory.
If the repository includes examples/pages/, use those files as reference input
when authoring real Workbench pages in pages/.
Only pages in the canonical pages/ directory are valid local verification
targets in this repository. After creating or visually modifying a page, use
nebula-component-validation to run repo-local static validation.
Use canvas-page-definition for the generic page-spec contract, and
canvas-workbench/references/pages.md for the Workbench-specific page preview
flow.