New Document Editor + Yjs type #998

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Related Issues

relates to #998
closes #720, closes #1111, closes #741

Checklist

• Add changelog entry linking to issue, describe API changes
• Add or update tests if needed
• Update docs if needed

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@cursor review

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PR Summary

Adds YDoc/Yjs across the stack (datatype, commits/yUpdate, WS sync, search indexing, CLI input) and updates React hooks while bumping React to 19.2.

• Core/Lib:
  • Add ydoc datatype (Value::YDoc), parsing/serialization (base64), and URLs (urls.YDOC, urls.Y_UPDATE, urls.DOCUMENT_CONTENT).
  • Extend Commit with yUpdate field; apply by merging Yjs updates; builder supports add_y_update.
  • Update defaults to include yUpdate property and recommend push/yUpdate in Commit.
• Server:
  • Introduce YSyncBroadcaster actor and WS messages (Y_SYNC_SUBSCRIBE, Y_SYNC_UNSUBSCRIBE, Y_SYNC_UPDATE) for live Yjs collaboration.
  • Wire broadcaster into AppState and WS handler; gate updates by write permissions.
  • Search: index plain text from Yjs documentContent by decoding Y updates.
  • Add yrs dependency.
• CLI:
  • Support YDoc input (base64 validation); add base64 dependency.
• React:
  • Bump to React ^19.2.0, update types, TS ^5.9.3; add yjs dev dep; enhance lint scripts.
  • Hooks: new useYDoc; useResource gains track prop and improved loading/local change handling; useResources, useCollection, useServerSearch performance/behavior updates; minor helpers added.
• Svelte:
  • Subscribe to LoadingChange in getResource; lint/script tweaks.
• Docs:
  • Document Yjs/YDoc, yUpdate in commits/JSON-AD/datatypes; expand JS lib docs for agents and Yjs usage.

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Bug: Top-Level Await Disrupts System Initialization

Top-level await enableYjs() call makes the module async, causing potential issues with React and build tool initialization. This should be called within a React effect or effect hook instead, or handled during store initialization within the App component.