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Hand a Proc passed as the last middleware argument to the middleware (#2967)

The middleware DSL recorded a registration as [operation, *args] and
appended the block only when one was given, so Stack#merge_with told the
block apart by its class: whatever Proc came last was popped and passed
as the block. A callable handed to a middleware as its last argument,
as in `use SomeMiddleware, ->(env) { ... }`, was taken for the block
instead, and the middleware was built without it, raising ArgumentError
when the stack was built. `insert_before` and `insert_after` did the
same.

Every registration now ends in its block, nil when none was given, and
merge_with always takes the last element as the block. That changes the
entries `API.middleware` returns, hence the UPGRADING note.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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