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Rank a nested rescue_from :all ahead of the enclosing scope's handlers (#3073)

A rescue_from :all declared in a namespace or a mounted API lost to any
class handler of an enclosing scope that matched, although a nested class
handler wins over an outer one whatever the classes are (#1405). The class
handlers of every scope were scanned before the catch-all was consulted.

The scope that declared rescue_from :all now ends its handlers with an
:all entry, so the catch-all ranks behind its own scope's class handlers
and ahead of every enclosing scope's. An exception it does not catch, one
that is not a StandardError, scans past it as before, and so does one
raised inside a rescue_from block, which is never handed to a catch-all.

The mount-order specs from #2384 pinned the outer class handler winning;
they now expect the mounted API's catch-all, for either mount order.

Supersedes #1982. See #1975.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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