A have of the bus module heard while the placement did not yet name its node as holding the bus
adopted nothing, and nothing adopted it again until the have changed, so a vault could stay without
the bus node's adoption and the loaded list's revision for good. The vault now keeps each node's
latest have and, on the placement's next change, adopts from the bus node's kept have if it was not
adopted: the placement's event, no timer. The rotation test now writes the have before the
placement (its wait for the vault's picture is gone), so it takes this path every run.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
jschoubben
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