Memory nodes section in F2 context screen with scoring visibility

Build a synthetic "Memory nodes (N scored, M unscored)" section in
the context screen by extracting Memory entries from the conversation
section. Each node shows its key and score. Inserted before the
conversation section so scores are visible at a glance.

This makes it easy to see whether scoring is keeping up — if unscored
count is high relative to scored, scoring needs to run more often.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/user/context.rs

@@ -24,10 +24,41 @@ impl ConsciousScreen {
     }
 
     fn read_context_sections(&self) -> Vec<crate::agent::context::ContextSection> {
-        match self.agent.try_lock() {
-            Ok(ag) => ag.context_sections().iter().map(|s| (*s).clone()).collect(),
-            Err(_) => Vec::new(),
+        use crate::agent::context::{ContextSection, ContextEntry, ConversationEntry};
+        use crate::agent::api::Message;
+
+        let ag = match self.agent.try_lock() {
+            Ok(ag) => ag,
+            Err(_) => return Vec::new(),
+        };
+
+        let mut sections: Vec<ContextSection> = ag.context_sections()
+            .iter().map(|s| (*s).clone()).collect();
+
+        // Build a synthetic "Memory nodes" section from conversation entries
+        let mut mem_section = ContextSection::new("Memory nodes");
+        let mut scored = 0usize;
+        let mut unscored = 0usize;
+        for ce in ag.context.conversation.entries() {
+            if let ConversationEntry::Memory { key, score, .. } = &ce.entry {
+                let label = match score {
+                    Some(s) => { scored += 1; format!("{} (score:{:.2})", key, s) }
+                    None => { unscored += 1; key.clone() }
+                };
+                mem_section.push(ContextEntry {
+                    entry: ConversationEntry::Message(Message::user(&label)),
+                    tokens: ce.tokens,
+                    timestamp: ce.timestamp,
+                });
+            }
         }
+        if !mem_section.is_empty() {
+            mem_section.name = format!("Memory nodes ({} scored, {} unscored)",
+                scored, unscored);
+            sections.insert(sections.len() - 1, mem_section); // before conversation
+        }
+
+        sections
     }
 }