#17's table said runner 'can close root once an admin user is proven'; the
class model (#26) superseded the per-role call, and close-root refuses on
class=server — runner's class. The gate does not change: the refusal message
now explains itself (server-class machines are automation identities whose
management plane IS root SSH; a CI box meant to be administered like a human
machine is --class human at bootstrap, not an exception), and the README's
identity-model section records the divergence in one paragraph. README also
documents the @root seed token and close-root's reachability proofs.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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