The part binds its own durable on the node-engine's kept stream (HearKept, tried at every wake until the pass has made it),
the seat's holders are read from the manifest of the digest each node says it runs, and a node-engine's account is granted its
own node at the part its definition names (running.<node>.*) and its durable on the kept stream by name.
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
Builds: design 47 G §199, §249, §309
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