poc-memory: fix distill placeholder, show link weights in render

- distill.agent: fix {{distill}} → {{nodes}} placeholder so seed
  nodes actually resolve
- render: show link strength values in the links section, sorted
  by strength descending

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

poc-memory/agents/distill.agent

@@ -56,4 +56,4 @@ For each seed node:
 
 ## Seed nodes
 
-{{distill}}
+{{nodes}}

poc-memory/src/cli/node.rs

@@ -199,7 +199,7 @@ pub fn cmd_render(key: &[String]) -> Result<(), String> {
         neighbors.dedup_by(|a, b| a.0 == b.0);
         let total = neighbors.len();
         let shown: Vec<_> = neighbors.iter().take(15)
-            .map(|(k, _)| format!("`poc-memory render {}`", k))
+            .map(|(k, s)| format!("({:.2})  `poc-memory render {}`", s, k))
             .collect();
         print!("\n\n---\nLinks:");
         for link in &shown {