Update user and developer documentation for the protocol-8 system: persistent
SPKI-derived identities, exact catalog ContentId authority, pinned responder
pulls, structured runtime ownership, direct-author Call to Play, and the global
local-network sharing switch.
Remove active descriptions of repository-wide certificates, pushed deltas,
relayed histories, and metadata consensus. Keep operational and UI boundaries
aligned with the implementation, including the fail-closed production catalog
gate.
Test Plan:
- `just fmt` (passed)
- `git diff --cached --check` (passed)
ddidderr
e0eafa6e33