The engine is ahead of its contract: it executes verified mutations but the
Mail service has no RPC to ask for one, so a human cannot move, delete or
flag anything. By this repo's definition of done the placement work has an
engine and nothing else.
Records the three steps that buy manual usability, what works and what does
not if you boot it today, the 81-issue backlog behind them, and the two test
traps (tracing callsite Interest, tokio::time::pause over real I/O) that are
invisible at default parallelism.
james.maes