tighten module interfaces: explicit re-exports, private helpers, inline dedup

- Replace `pub use types::*` in store/mod.rs with explicit re-export list
- Make transcript_dedup_key private in agents/enrich.rs (only used internally)
- Inline duplicated projects_dir() helper in agents/knowledge.rs and daemon.rs

poc-memory/src/store/mod.rs

@@ -26,7 +26,13 @@ mod persist;
 mod ops;
 
 // Re-export everything callers need
-pub use types::*;
+pub use types::{
+    memory_dir, nodes_path,
+    now_epoch, epoch_to_local, format_date, format_datetime, format_datetime_space, today,
+    Node, Relation, NodeType, Provenance, RelationType,
+    RetrievalEvent, Params, GapRecord, Store,
+    new_node, new_relation,
+};
 pub use parse::{MemoryUnit, parse_units};
 pub use view::{StoreView, AnyView};
 pub use persist::fsck;