Add ork-server crate with virtfs EDSL
- virtfs: Declarative filesystem EDSL (port of ollie's pattern)
- dir(), file(), each(), dir_dynamic() constructors
- read(), write(), rdwr(), rw() handlers
- FsNode with walk(), list(), read(), write()
- state: OrkState manages parsed documents
- Scans org directory, parses on load
- Section ID from CUSTOM_ID > ID > slugified title
- Read/write document content
- namespace: 9P namespace builder
- ctl, idx, keywords at root
- agenda/todos, agenda/today, agenda/week
- {doc}/ with raw, meta, and sections
- {section}/ with headline, title, keyword, priority, tags
- Nested children for subsections
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