feat: Vestige v1.3.0 — importance scoring, session checkpoints, duplicate detection

3 new MCP tools (16 → 19 total):
- importance_score: 4-channel neuroscience importance scoring (novelty/arousal/reward/attention)
- session_checkpoint: batch smart_ingest up to 20 items with PE Gating
- find_duplicates: cosine similarity clustering with union-find for dedup

CLI: vestige ingest command for memory ingestion via command line
Core: made get_node_embedding public, added get_all_embeddings for dedup scanning

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/vestige-core/src/storage/sqlite.rs

@@ -478,7 +478,7 @@ impl Storage {
 
     /// Get the embedding vector for a node
     #[cfg(all(feature = "embeddings", feature = "vector-search"))]
-    fn get_node_embedding(&self, node_id: &str) -> Result<Option<Vec<f32>>> {
+    pub fn get_node_embedding(&self, node_id: &str) -> Result<Option<Vec<f32>>> {
         let mut stmt = self.conn.prepare(
             "SELECT embedding FROM node_embeddings WHERE node_id = ?1"
         )?;
@@ -492,6 +492,29 @@ impl Storage {
         }))
     }
 
+    /// Get all embedding vectors for duplicate detection
+    #[cfg(all(feature = "embeddings", feature = "vector-search"))]
+    pub fn get_all_embeddings(&self) -> Result<Vec<(String, Vec<f32>)>> {
+        let mut stmt = self
+            .conn
+            .prepare("SELECT node_id, embedding FROM node_embeddings")?;
+
+        let results: Vec<(String, Vec<f32>)> = stmt
+            .query_map([], |row| {
+                let node_id: String = row.get(0)?;
+                let embedding_bytes: Vec<u8> = row.get(1)?;
+                Ok((node_id, embedding_bytes))
+            })?
+            .filter_map(|r| r.ok())
+            .filter_map(|(id, bytes)| {
+                crate::embeddings::Embedding::from_bytes(&bytes)
+                    .map(|e| (id, e.vector))
+            })
+            .collect();
+
+        Ok(results)
+    }
+
     /// Update the content of an existing node
     pub fn update_node_content(&mut self, id: &str, new_content: &str) -> Result<()> {
         let now = Utc::now();