The window opens while a counted node-engine reads, of some kind, none of the newest form sdk/forms knows, and closes
when none does: said once as version.old-form-closed, and a node holding it seven days is old-form-held about it. It
steps on a statement's change, the placement, a hand drop and each build key written, never on a timer. A retired node
dropped by hand leaves the count of the forms a build key keeps (design 51). internal/versions' own Forms goes: which
forms a key keeps is sdk/forms'.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
jschoubben
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