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Run every endpoint's Rack stack through one shared lambda (#2974)

The innermost app of an endpoint's Rack stack looks the endpoint up in
the env and runs it, so it closes over nothing -- yet build_stack
allocated a fresh lambda for it on every endpoint.

Hoist it to a single constant. That lambda answers to the class rather
than to an endpoint, so #run can no longer be reached as a peer -- and
it was only ever protected to be reachable that way. Make it public: it
is where the stack ends, it belongs next to #call and #call!, and it now
says in a doc comment what it expects of its caller. #execute and the
rest of the endpoint's internals stay protected.

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

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