v0.3.3-pre.003

crates/ksp-store-postgres-lib/src/error.rs

@@ -1,5 +1,9 @@
 // file: crates/ksp-store-postgres-lib/src/error.rs
-// version: 3
+// version: 4
+
+/// Stable KSP error code reserved for PostgreSQL retention transitions that require unsupported physical compaction.
+pub const ERROR_CODE_POSTGRES_RETENTION_COMPACTION_UNSUPPORTED: ksp_store_api::ErrorCode =
+    ksp_store_api::ErrorCode::new("store", "postgres_retention_compaction_unsupported");
 
 /// Safe backend-local classification used by the Store facade for stable error mapping.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]