The vault consumes the licence manager's binding.changed and, at its start,
asks the seat's bindings until it answers; it keeps each consumer's licence,
the licence's key and the generation in its own state licence-bindings,
never an older generation, deleting a released consumer's key. The state is
in the vault's old state section, and holds no secret.
Builds: design 39 bus-and-switch §17, B2, B9, B10, B22, B25
Claude-Session: https://claude.ai/code/session_01NcbgfHb9d4T9nq5Q6WqdiJ
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