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/journal.rs

@@ -1,5 +1,6 @@
 // cli/journal.rs — journal subcommand handlers
 
+use crate::agent::tools::memory;
 
 pub fn cmd_tail(n: usize, full: bool, provenance: Option<&str>, dedup: bool) -> Result<(), String> {
     let path = crate::store::nodes_path();
@@ -66,32 +67,23 @@ pub fn cmd_tail(n: usize, full: bool, provenance: Option<&str>, dedup: bool) ->
     Ok(())
 }
 
-pub fn cmd_journal_tail(n: usize, full: bool, level: u8) -> Result<(), String> {
-    let format = if full { "full" } else { "compact" };
-    let result = crate::mcp_server::memory_rpc(
-        "journal_tail",
-        serde_json::json!({"count": n, "level": level, "format": format}),
-    ).map_err(|e| e.to_string())?;
+pub async fn cmd_journal_tail(n: usize, full: bool, level: u8) -> Result<(), String> {
+    let format = if full { Some("full") } else { Some("compact") };
+    let result = memory::journal_tail(None, Some(n as u64), Some(level as u64), format, None).await
+        .map_err(|e| e.to_string())?;
     print!("{}", result);
     Ok(())
 }
 
-pub fn cmd_journal_write(name: &str, text: &[String]) -> Result<(), String> {
+pub async fn cmd_journal_write(name: &str, text: &[String]) -> Result<(), String> {
     if text.is_empty() {
         return Err("journal write requires text".into());
     }
     super::check_dry_run();
     let body = text.join(" ");
 
-    let result = crate::mcp_server::memory_rpc(
-        "journal_new",
-        serde_json::json!({
-            "name": name,
-            "title": name,
-            "body": body,
-            "level": 0
-        }),
-    ).map_err(|e| e.to_string())?;
+    let result = memory::journal_new(None, name, name, &body, Some(0)).await
+        .map_err(|e| e.to_string())?;
     println!("{}", result);
     Ok(())
 }