cli: convert write/delete/journal-write to use memory_rpc

- cmd_write → memory_write RPC
- cmd_node_delete → new memory_delete MCP tool + RPC
- cmd_journal_write → journal_new RPC

Removes validate_inline_refs and find_current_transcript
(now handled server-side or not needed).

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

src/agent/tools/memory.rs

@@ -115,6 +115,7 @@ async fn dispatch(
         "memory_links" => links(&args).await,
         "memory_link_set" => link_set(&args).await,
         "memory_link_add" => link_add(agent, &args).await,
+        "memory_delete" => delete(&args).await,
         "memory_weight_set" => weight_set(&args).await,
         "memory_rename" => rename(&args).await,
         "memory_supersede" => supersede(agent, &args).await,
@@ -130,7 +131,7 @@ async fn dispatch(
 
 // ── Definitions ────────────────────────────────────────────────
 
-pub fn memory_tools() -> [super::Tool; 12] {
+pub fn memory_tools() -> [super::Tool; 13] {
     use super::Tool;
     [
         Tool { name: "memory_render", description: "Read a memory node's content and links.",
@@ -151,6 +152,9 @@ pub fn memory_tools() -> [super::Tool; 12] {
         Tool { name: "memory_link_add", description: "Add a new link between two nodes.",
                parameters_json: r#"{"type":"object","properties":{"source":{"type":"string"},"target":{"type":"string"}},"required":["source","target"]}"#,
                handler: Arc::new(|a, v| Box::pin(async move { dispatch("memory_link_add", &a, v).await })) },
+        Tool { name: "memory_delete", description: "Delete a memory node.",
+               parameters_json: r#"{"type":"object","properties":{"key":{"type":"string","description":"Node key"}},"required":["key"]}"#,
+               handler: Arc::new(|a, v| Box::pin(async move { dispatch("memory_delete", &a, v).await })) },
         Tool { name: "memory_weight_set", description: "Set a node's weight directly (0.01 to 1.0).",
                parameters_json: r#"{"type":"object","properties":{"key":{"type":"string"},"weight":{"type":"number","description":"0.01 to 1.0"}},"required":["key","weight"]}"#,
                handler: Arc::new(|a, v| Box::pin(async move { dispatch("memory_weight_set", &a, v).await })) },
@@ -311,6 +315,16 @@ async fn link_add(agent: &Option<std::sync::Arc<crate::agent::Agent>>, args: &se
     Ok(format!("linked {} → {} (strength={:.2})", s, t, strength))
 }
 
+async fn delete(args: &serde_json::Value) -> Result<String> {
+    let key = get_str(args, "key")?;
+    let arc = cached_store().await?;
+    let mut store = arc.lock().await;
+    let resolved = store.resolve_key(key).map_err(|e| anyhow::anyhow!("{}", e))?;
+    store.delete_node(&resolved).map_err(|e| anyhow::anyhow!("{}", e))?;
+    store.save().map_err(|e| anyhow::anyhow!("{}", e))?;
+    Ok(format!("deleted {}", resolved))
+}
+
 async fn weight_set(args: &serde_json::Value) -> Result<String> {
     let arc = cached_store().await?;
     let mut store = arc.lock().await;