refactor(atom): use simple KeyMetadata name in Molecule field types

crates/core/src/atom/molecule.rs

@@ -1,7 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
-use super::{deterministic_molecule_uuid, now_nanos, MergeConflict};
+use super::{deterministic_molecule_uuid, now_nanos, KeyMetadata, MergeConflict};
 use crate::atom::provenance::Provenance;
 use crate::security::Ed25519KeyPair;
 
@@ -20,7 +20,7 @@ pub struct Molecule {
     #[serde(default)]
     version: u64,
     #[serde(default, skip_serializing_if = "Option::is_none")]
-    key_metadata: Option<super::KeyMetadata>,
+    key_metadata: Option<KeyMetadata>,
     /// Base64-encoded public key of the writer who last signed this molecule.
     #[serde(default)]
     writer_pubkey: String,
@@ -117,13 +117,13 @@ impl Molecule {
     }
 
     /// Sets per-key metadata on the molecule.
-    pub fn set_key_metadata(&mut self, meta: super::KeyMetadata) {
+    pub fn set_key_metadata(&mut self, meta: KeyMetadata) {
         self.key_metadata = Some(meta);
     }
 
     /// Returns the per-key metadata, if any.
     #[must_use]
-    pub fn get_key_metadata(&self) -> Option<&super::KeyMetadata> {
+    pub fn get_key_metadata(&self) -> Option<&KeyMetadata> {
         self.key_metadata.as_ref()
     }
 

crates/core/src/atom/molecule_hash.rs

@@ -2,7 +2,7 @@ use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
-use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, MergeConflict};
+use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, KeyMetadata, MergeConflict};
 use crate::security::Ed25519KeyPair;
 
 /// A hash-based collection of atom references stored in a HashMap.
@@ -16,7 +16,7 @@ pub struct MoleculeHash {
     #[serde(default)]
     version: u64,
     #[serde(default)]
-    key_metadata: HashMap<String, super::KeyMetadata>,
+    key_metadata: HashMap<String, KeyMetadata>,
 }
 
 impl MoleculeHash {

crates/core/src/atom/molecule_hash_range.rs

@@ -10,7 +10,7 @@ use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use std::collections::{BTreeMap, HashMap};
 
-use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, MergeConflict};
+use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, KeyMetadata, MergeConflict};
 
 /// A hash-range-based collection of atom references stored in a nested HashMap<BTreeMap> structure.
 ///
@@ -38,7 +38,7 @@ pub struct MoleculeHashRange {
     /// Per-key metadata organized by hash and range values
     /// Structure: HashMap<hash_value, BTreeMap<range_value, KeyMetadata>>
     #[serde(default)]
-    key_metadata: HashMap<String, BTreeMap<String, crate::atom::KeyMetadata>>,
+    key_metadata: HashMap<String, BTreeMap<String, KeyMetadata>>,
 }
 
 impl MoleculeHashRange {

crates/core/src/atom/molecule_range.rs

@@ -2,7 +2,7 @@ use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 
-use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, MergeConflict};
+use super::{deterministic_molecule_uuid, now_nanos, AtomEntry, KeyMetadata, MergeConflict};
 use crate::security::Ed25519KeyPair;
 
 /// A range-based collection of atom references stored in a BTreeMap.
@@ -15,7 +15,7 @@ pub struct MoleculeRange {
     #[serde(default)]
     version: u64,
     #[serde(default)]
-    key_metadata: BTreeMap<String, super::KeyMetadata>,
+    key_metadata: BTreeMap<String, KeyMetadata>,
 }
 
 impl MoleculeRange {