Function tool_call_origin_id 

pub fn tool_call_origin_id(call_id: &str, row_seq: i64) -> String

Canonical id for a ToolCallStarted origin row. This is the row-level identity an awaited engine dispatch consults; the protocol event itself still carries a seq-derived display id, but the durable record uses this shape so a tool result can deterministically find its origin at replay time.