store: a write inside a list checked where the rules judge it

Review 2, N9: the API checked a write's capability on the path asked
(servers/list/3/name), the rules on the list it is in (servers/list):
a user whose capability lay inside a list had every such write pass the
API and refused by the node's own judgement (403, after rolling the
document back).

inspect::placed places a write's path in the document by the rule the
inspector places operations by (Place::child: cut after the first list
or text on the way), and the store's writes check capabilities there.
One rule for both; a test checks placed against the paths the inspector
finds in the change such a write makes.

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