rename agent: fix tool calls and target override

- Add memory_rename tool (in-place rename, preserves content and links)
- Update rename.agent prompt to use memory_rename() instead of text output
- Fix {{rename}} placeholder to respect --target keys when provided
- Add format_rename_targets() for targeted rename runs

src/subconscious/prompts.rs

@@ -303,6 +303,38 @@ pub fn format_rename_candidates(store: &Store, count: usize) -> (Vec<String>, St
     (keys, out)
 }
 
+/// Format specific target keys as rename candidates (for --target mode)
+pub fn format_rename_targets(store: &Store, keys: &[String]) -> String {
+    let mut out = String::new();
+    out.push_str(&format!("## Nodes to rename ({} targets)\n\n", keys.len()));
+
+    for key in keys {
+        let Some(node) = store.nodes.get(key) else {
+            out.push_str(&format!("### {}\n\n(node not found)\n\n---\n\n", key));
+            continue;
+        };
+        out.push_str(&format!("### {}\n", key));
+        let created = if node.timestamp > 0 {
+            crate::store::format_datetime(node.timestamp)
+        } else {
+            "unknown".to_string()
+        };
+        out.push_str(&format!("Created: {}\n", created));
+
+        let content = &node.content;
+        if content.len() > 800 {
+            let truncated = crate::util::truncate(content, 800, "\n[...]");
+            out.push_str(&format!("\nContent ({} chars, truncated):\n{}\n\n",
+                content.len(), truncated));
+        } else {
+            out.push_str(&format!("\nContent:\n{}\n\n", content));
+        }
+
+        out.push_str("---\n\n");
+    }
+    out
+}
+
 /// Get split candidates sorted by size (largest first)
 pub fn split_candidates(store: &Store) -> Vec<String> {
     let mut candidates: Vec<(&str, usize)> = store.nodes.iter()