- links() in memory.rs: use cached_store() instead of MemoryNode::load()
- identity.rs: use memory_rpc for Store context loading
- defs.rs: delete dead placeholders (topology, nodes/episodes, health, split)
- agents now use {{tool: graph_topology}} etc instead
- prompts.rs: delete unused format_split_plan_node()
Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>