Add local document resource commands

AGENTS.md

@@ -123,6 +123,8 @@ Roadmap items should be actionable and checkable:
   and sync are still roadmap work.
 - KV stores support local SQLite-backed create/set/get. Iroh Documents
   replication and prefix-capability enforcement are still roadmap work.
+- Document resources can be registered locally with empty JSON state and
+  local-only status. Automerge editing/state and sync are still roadmap work.
 - Signed peer-card LAN discovery payloads, peer auth over Iroh, cr-sqlite,
   iroh-docs, iroh-gossip, iroh-blobs, Automerge sync, real auth enforcement,
   OpenSSH KRL generation, and Keyhive/BeeKEM-style authorization are future