postMessage protocol (v1)

All messages include v: 1. HTML and React use the same protocol. See Embed with React.

Parent → iframe

type	Purpose
`render`	Token plus the full chart payload. Replaces the graph.
`focus`	Focus a node by partner ID
`exclude`	Hide nodes by partner ID list
`find`	Search by name
`resetView`	Restore the last rendered graph view

type	Purpose
`ready`	Iframe is ready for `render`
`rendered`	Layout complete (`nodeCount`, `edgeCount` only)
`nodeClick`	The ID you sent and the node type
`findResults`	Matching IDs from your payload
`error`	Structured error code
`resize`	iframe content size changed