Add graph_topology, graph_health, interference_pairs tools

Convert {{topology}}, {{health}}, {{pairs}} placeholders to
{{tool:}} calls. Made format_topology_header, format_health_section,
format_pairs_section pub so tools can call them.

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

src/agent/tools/memory.rs

@@ -33,7 +33,7 @@ async fn get_provenance(agent: &Option<std::sync::Arc<crate::agent::Agent>>) ->
 
 // ── Definitions ────────────────────────────────────────────────
 
-pub fn memory_tools() -> [super::Tool; 11] {
+pub fn memory_tools() -> [super::Tool; 14] {
     use super::Tool;
     [
         Tool { name: "memory_render", description: "Read a memory node's content and links.",
@@ -69,6 +69,15 @@ pub fn memory_tools() -> [super::Tool; 11] {
         Tool { name: "memory_query", description: "Run a structured query against the memory graph.",
                parameters_json: r#"{"type":"object","properties":{"query":{"type":"string","description":"Query expression"}},"required":["query"]}"#,
                handler: Arc::new(|_a, v| Box::pin(async move { query(&v).await })) },
+        Tool { name: "graph_topology", description: "Show graph topology stats (nodes, edges, clustering, hubs).",
+               parameters_json: r#"{"type":"object","properties":{}}"#,
+               handler: Arc::new(|_a, _v| Box::pin(async { graph_topology().await })) },
+        Tool { name: "graph_health", description: "Show graph health report with maintenance recommendations.",
+               parameters_json: r#"{"type":"object","properties":{}}"#,
+               handler: Arc::new(|_a, _v| Box::pin(async { graph_health().await })) },
+        Tool { name: "interference_pairs", description: "Find similar nodes that may interfere (duplicates or near-duplicates).",
+               parameters_json: r#"{"type":"object","properties":{"threshold":{"type":"number","description":"Similarity threshold (default 0.5)"},"limit":{"type":"integer","description":"Max pairs to return (default 10)"}}}"#,
+               handler: Arc::new(|_a, v| Box::pin(async move { interference_pairs(&v).await })) },
     ]
 }
 
@@ -317,3 +326,30 @@ async fn journal_update(agent: &Option<std::sync::Arc<crate::agent::Agent>>, arg
     let word_count = body.split_whitespace().count();
     Ok(format!("Updated last entry (+{} words)", word_count))
 }
+
+// ── Graph tools ───────────────────────────────────────────────
+
+async fn graph_topology() -> Result<String> {
+    let arc = cached_store().await?;
+    let store = arc.lock().await;
+    let graph = store.build_graph();
+    Ok(crate::subconscious::prompts::format_topology_header(&graph))
+}
+
+async fn graph_health() -> Result<String> {
+    let arc = cached_store().await?;
+    let store = arc.lock().await;
+    let graph = store.build_graph();
+    Ok(crate::subconscious::prompts::format_health_section(&store, &graph))
+}
+
+async fn interference_pairs(args: &serde_json::Value) -> Result<String> {
+    let threshold = args.get("threshold").and_then(|v| v.as_f64()).unwrap_or(0.5) as f32;
+    let limit = args.get("limit").and_then(|v| v.as_u64()).unwrap_or(10) as usize;
+    let arc = cached_store().await?;
+    let store = arc.lock().await;
+    let graph = store.build_graph();
+    let mut pairs = crate::neuro::detect_interference(&store, &graph, threshold);
+    pairs.truncate(limit);
+    Ok(crate::subconscious::prompts::format_pairs_section(&pairs, &store, &graph))
+}

src/subconscious/agents/challenger.agent

@@ -46,7 +46,7 @@ For each target node, one of:
 - **Don't be contrarian for its own sake.** If a node is correct,
   say so and move on.
 
-{{TOPOLOGY}}
+{{tool: graph_topology}}
 
 {{SIBLINGS}}
 

src/subconscious/agents/connector.agent

@@ -79,7 +79,7 @@ Set with: `poc-memory graph link-set <source> <target> <strength>`
 If you see default-strength links (0.10 or 0.30) in the neighborhoods
 you're exploring and you have context to judge them, reweight those too.
 
-{{TOPOLOGY}}
+{{tool: graph_topology}}
 
 ## Nodes to examine for cross-community connections
 

src/subconscious/agents/extractor.agent

@@ -44,7 +44,7 @@ pattern you've found.
 - **Preserve diversity.** Multiple perspectives on the same concept are
   valuable. Only delete actual duplicates.
 
-{{TOPOLOGY}}
+{{tool: graph_topology}}
 
 ## Neighborhood nodes
 

src/subconscious/agents/health.agent

@@ -36,8 +36,8 @@ overall structure.
 - Most output should be observations about system health. Act on structural
   problems you find — link orphans, refine outdated nodes.
 
-{{topology}}
+{{tool: graph_topology}}
 
 ## Current health data
 
-{{health}}
+{{tool: graph_health}}

src/subconscious/agents/replay.agent

@@ -40,7 +40,7 @@ clusters and determine how it fits.
 - **Trust the decay.** Unimportant nodes don't need pruning — just
   don't link them.
 
-{{TOPOLOGY}}
+{{tool: graph_topology}}
 
 ## Nodes to review
 

src/subconscious/agents/separator.agent

@@ -35,8 +35,8 @@ overlapping inputs and orthogonalize them.
 - **Session summaries are the biggest source of interference.**
 - **Look for the supersession pattern.**
 
-{{topology}}
+{{tool: graph_topology}}
 
 ## Interfering pairs to review
 
-{{pairs}}
+{{tool: interference_pairs}}

src/subconscious/agents/transfer.agent

@@ -45,7 +45,7 @@ entries, and extract those patterns into semantic nodes.
 - **The best extractions change how you think, not just what you know.**
   Extract the conceptual version, not just the factual one.
 
-{{TOPOLOGY}}
+{{tool: graph_topology}}
 
 {{SIBLINGS}}
 

src/subconscious/prompts.rs

@@ -23,7 +23,7 @@ pub struct AgentBatch {
     pub node_keys: Vec<String>,
 }
 
-pub(super) fn format_topology_header(graph: &Graph) -> String {
+pub fn format_topology_header(graph: &Graph) -> String {
     let sigma = graph.small_world_sigma();
     let alpha = graph.degree_power_law_exponent();
     let gini = graph.degree_gini();
@@ -139,7 +139,7 @@ pub(super) fn format_nodes_section(store: &Store, items: &[ReplayItem], graph: &
     out
 }
 
-pub(super) fn format_health_section(store: &Store, graph: &Graph) -> String {
+pub fn format_health_section(store: &Store, graph: &Graph) -> String {
     use crate::graph;
 
     let health = graph::health_report(graph, store);
@@ -195,7 +195,7 @@ pub(super) fn format_health_section(store: &Store, graph: &Graph) -> String {
     out
 }
 
-pub(super) fn format_pairs_section(
+pub fn format_pairs_section(
     pairs: &[(String, String, f32)],
     store: &Store,
     graph: &Graph,