Function is_unexpected_session_source 

pub fn is_unexpected_session_source(source: &str) -> bool

Sources that indicate the process did NOT inherit an explicit identity signal from its launcher. machine-default means a bare CLI / no session id at all; minted means an MCP server fell through to a fresh per-process key. Either way, a long-running inbox-owning role running under one of these sources is almost certainly NOT the identity its launcher intended (#284.4: the operator-facing symptom is a spawn that should have inherited WIRE_HOME but didn’t, and then silently writes to / blocks on the cwd-default home alongside a sibling process serving the real session-key home).