Scaffold Zen Editor (Svelte + Lexical + Yjs)

[google-labs-jules]

Introduced a new "Zen Editor" subproject in editor/ to serve as a local "second brain" authoring environment.

Features:

• Frontend: Svelte + svelte-lexical for a minimalist, "Kinfolk-inspired" writing interface.
• Sync: Real-time collaboration via yjs and WebSocket, supporting LAN access (iPad/Desktop).
• Backend: Node.js server (editor/server/) with custom Yjs implementation (bypassing y-websocket export limits).
• Persistence: SQLite database (zen.db) stores document state, updated with a debounce strategy.
• Plan: Added PLAN.md outlining the architecture and future roadmap (plugins, Astro publication).

This is a standalone scaffold that does not yet modify the existing Astro site or build process.

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PR created automatically by Jules for task 12769988621536726950 started by @emintham

[google-labs-jules]

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