test(server): runtime evidence driver for PR detail check fallback

Drives the real server's pullRequests.detail RPC against a stubbed
GitHub Enterprise forge, one pull request number per fixture row, and
records the stub requests and the client-received detail or error.
Recordings were captured against 6a346ccad1 (after) and 8d3b061121
(before, touched source files swapped in).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
b12b6c393eJulius Marminge committed on 10/22/2026, 11:13:54 AMparent6a346cc

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