- Add JSON struct tags to MasterPageBlock and MasterPageDefinition
- Change MasterPageBlock.HtmlContent from string to *string (nullable)
- Change BlockNote renderer signatures from []any to []map[string]any
- Move type assertions to JSON boundary in blocksFromRaw/inlineContentFromRaw
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Initialize git.dev.alexdunmow.com/ninja/core with Go 1.26 module,
package directory structure, and README.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>