Replaces the configuration and CLEARS the connectivity verdict, because a verdict
measured against the previous configuration says nothing about this one. An edit
that happens to produce identical configuration keeps its verdict — the same rule
stated precisely, not a second rule.

An ACTIVE provider whose configuration is replaced becomes unverified again and stops delivering until it is retested and re-enabled.

A chainPosition in the body is applied with insertion + renumber

semantics: the provider moves to that index of this scope's chain for its channel
and the others keep their relative order, renumbered contiguously from 0 in one
transaction. An ABSENT chainPosition leaves the position unchanged —
it is never defaulted to 0, which would silently promote an edited provider to
primary.