holdings: a member of a Space publishes what they hold as room-salted album keys, sealed to the room, so "who has this" is answered while they are offline

crates/persona-state/src/lib.rs

@@ -21,6 +21,7 @@ pub mod playlist;
 pub mod inbox;
 pub mod space;
 pub mod proposals;
+pub mod holdings;
 
 pub const SCHEMA_VERSION: u32 = 1;
 pub const SIGN_DOMAIN: &str = "soulstream.profile/v1";