CLI/hippocampus: rename core memory functions to memory_*

Aligns function names with tool names for consistency:
- hippocampus: render → memory_render, write → memory_write, etc.
- tools/memory.rs: macro no longer prepends memory_ prefix
- CLI files: use typed async API throughout (graph.rs, journal.rs, admin.rs)

This eliminates the "memory_graph_topology" tool name bug where
graph_* and journal_* tools were incorrectly prefixed.

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

src/cli/admin.rs

@@ -328,20 +328,18 @@ pub fn cmd_dedup(apply: bool) -> Result<(), String> {
     Ok(())
 }
 
-pub fn cmd_health() -> Result<(), String> {
-    let result = crate::mcp_server::memory_rpc(
-        "graph_health",
-        serde_json::json!({}),
-    ).map_err(|e| e.to_string())?;
+pub async fn cmd_health() -> Result<(), String> {
+    use crate::agent::tools::memory;
+    let result = memory::graph_health(None).await
+        .map_err(|e| e.to_string())?;
     print!("{}", result);
     Ok(())
 }
 
-pub fn cmd_topology() -> Result<(), String> {
-    let result = crate::mcp_server::memory_rpc(
-        "graph_topology",
-        serde_json::json!({}),
-    ).map_err(|e| e.to_string())?;
+pub async fn cmd_topology() -> Result<(), String> {
+    use crate::agent::tools::memory;
+    let result = memory::graph_topology(None).await
+        .map_err(|e| e.to_string())?;
     print!("{}", result);
     Ok(())
 }
@@ -422,11 +420,10 @@ pub fn cmd_export(files: &[String], export_all: bool) -> Result<(), String> {
     Ok(())
 }
 
-pub fn cmd_status() -> Result<(), String> {
-    let result = crate::mcp_server::memory_rpc(
-        "graph_topology",
-        serde_json::json!({}),
-    ).map_err(|e| e.to_string())?;
+pub async fn cmd_status() -> Result<(), String> {
+    use crate::agent::tools::memory;
+    let result = memory::graph_topology(None).await
+        .map_err(|e| e.to_string())?;
     print!("{}", result);
     Ok(())
 }