Draft: Public-Signed Spaces

[antontranelis]

Summary

• Adds a non-normative research draft for public link / White-Label spaces.
• Separates encrypted member spaces from future public-signed spaces.
• Documents read/write/join policy axes, public descriptors, live update verification, write capabilities, and RLS mapping.

Status

• Draft / non-normative.
• No schemas, test vectors, or conformance changes.
• Intended to guide TypeScript extension points before the Real Life Stack reference app migration.

Validation

• npm run validate