Action implementations for the script_author tool — the boundary over YmerNode.Scripts's write verbs.

Same shape as YmerNode.Mcp.Tools.Scripts.Actions, and for the same reason: every extracted scalar is guarded on its head, and each guarded head is followed by a wrong-typed twin that answers a message rather than letting the context's own guard raise. Two strings, nothing else — there is no range and no vocabulary here, so there is no Validate layer.

create's response carries the stored script the way update and accept do, rather than only its name: a caller that has just written a script wants to see what the node made of it — the derived name most of all, since it never supplied one.