Review follow-up on the anthropic_adapter batch salvage:
1. #52145 shipped no behavior test for the adjacency rewrite. Add
test_strips_tool_use_when_result_not_immediately_adjacent (a tool_use whose
result appears later but NOT in the immediately-following user message must
be stripped — the exact case the old global id-match got wrong) plus an
adjacent-pair control. Mutation-checked: reverting to a global match fails
the non-adjacent test.
2. test_token_refresh_ua_prefix was vacuous — it bound to _refresh_oauth_token
(a wrapper with no urllib.request.Request), so its assert never ran and it
did NOT guard the real refresh UA site. Retarget it at
refresh_anthropic_oauth_pure (:1048) with the header-scoped check. Mutation-
checked: reverting :1048 to claude-cli/ now fails it.
