ADR 0593 §6, §7: the grants part creates composed-<node> per node, grants each engine the writes of its
own bucket and a direct get of the indexer's candidates for compose-candidate, and grants
mesh-host.composed read-only, with the stream listing and creation advisory a per-node read needs, to
the provisioner, the assigner and the view alone; memberships issue it per node.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
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