refactor(rmcp): move MCP tool registry to core

Author: benbrandt

Cargo.lock

@@ -15,7 +15,6 @@ agent-client-protocol.workspace = true
 futures.workspace = true
 futures-concurrency.workspace = true
 rmcp.workspace = true
-rustc-hash.workspace = true
 schemars.workspace = true
 serde.workspace = true
 serde_json.workspace = true