close AI-213
#### PR Dependency Tree
* **PR #12846** 👈
* **PR #12811**
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **New Features**
- Introduced support for AI-editable blocks in document parsing,
allowing blocks to include metadata for AI-based editing.
- Added rendering for todo list items with markdown checkbox syntax.
- Unsupported block types are now marked with placeholders in the parsed
output.
- **Tests**
- Added new test cases and snapshots to verify parsing behavior with
AI-editable content enabled.
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