Expire unconsumed native metadata preparations atomically

src/callisto/mst2_metadata_prepare.rs

@@ -23,6 +23,7 @@ pub struct Model {
     pub edge_count: i32,
     pub total_bytes: i64,
     pub state: String,
+    pub deadline_managed: bool,
     pub created_at: DateTimeWithTimeZone,
     pub committed_at: Option<DateTimeWithTimeZone>,
 }

src/ceres/snapshot/mod.rs

@@ -1,13 +1,14 @@
 //! MST/2 snapshot domain (spec 02/03): fixed views over pinned Git trees.
 //!
-//! Slice scope (T02-a): native monorepo views only — no bindings, imports or
-//! release policy yet (T04/T05). Everything here resolves against fixed OIDs;
-//! no code path in this module may read current refs.
+//! Serving remains native-only. The independent namespace index is an unwired
+//! composition seam; identity, attestation and publication integration remain
+//! separate gates. Fixed-source readers must never look up current refs.
 pub mod chunks;
 pub mod descriptor;
 pub mod error;
 pub mod frame_stream;
 pub(crate) mod metadata_install;
+pub mod namespace;
 pub mod pages;
 pub(crate) mod projection_observation;
 pub mod publication;