[nicodes]

Keep one root README with client installation, configuration and usage. Maintain authored documentation in the private documentation repository, retain functional inputs under non-Markdown names, and enforce the layout and reviewed README digest in CI.

Validation: canonical publication/layout checks pass; functional plugin migrations were regression tested. The documentation-policy job validates this exact head.

This PR uses a cleaned base so its diff contains no removed private material. After exact-head checks pass, the approved head will replace the original public main during the separately recorded leased history cleanup.

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