cli: add memory_history, remove dump-json/edges/lookups

- Add memory_history MCP tool for version history
- Convert cmd_history to use memory_rpc
- Add raw parameter to memory_render for editing
- Remove unused: dump-json, list-edges, lookup-bump, lookups
- Fix render_node path in defs.rs/subconscious.rs

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

src/mind/subconscious.rs

@@ -534,7 +534,7 @@ impl Subconscious {
             for key in surface_str.lines().map(|l| l.trim()).filter(|l| !l.is_empty()) {
                 if existing.contains(key) { continue; }
                 if let Some(rendered) = store_guard.as_ref()
-                    .and_then(|s| crate::cli::node::render_node(s, key))
+                    .and_then(|s| crate::hippocampus::memory::render_node(s, key))
                 {
                     nodes.push(AstNode::memory(
                         key,