Fix Anthropic PR lens request body

[haasonsaas]

Summary

• remove the deprecated temperature parameter from Anthropic Messages API calls used by EvalOps PR lens reviews
• add a regression test that captures the Anthropic request body and asserts temperature is omitted

Why

evalops-pr-lens/* status contexts are currently erroring across open deploy/platform PRs with:

Anthropic API failed with HTTP 400: ... "temperature" is deprecated for this model.

That is blocking deploy train PRs, including evalops/deploy#2828 and the active train cut PR.

Validation

• ruby -Itest test/evalops_pr_lens_review_test.rb --name test_call_anthropic_omits_deprecated_temperature_parameter
• ruby -Itest test/evalops_pr_lens_review_test.rb
• ruby -Itest test/check_pr_review_threads_test.rb
• ruby -Itest test/classify_agent_authorship_test.rb
• ruby -Itest test/publish_codex_structured_review_test.rb
• ruby -Itest test/validate_services_catalog_test.rb
• ruby -Itest test/sweep_recent_review_feedback_test.rb

[cursor]

PR Summary

Low Risk
Low risk: a small change to the Anthropic request payload plus a focused regression test; behavior change is limited to removing a single (now-invalid) field from API calls.

Overview
Fixes EvalOps PR lens Anthropic calls by removing the deprecated temperature field from the request body in call_anthropic, preventing 400s on newer Claude models.

Adds a regression test that stubs Net::HTTP.start, captures the outgoing JSON payload, and asserts temperature is not sent.

^{Reviewed by Cursor Bugbot for commit 69843e0. Bugbot is set up for automated code reviews on this repo. Configure here.}

[haasonsaas]

Closing as superseded: main now contains cca3cef (Fix Opus PR lens request parameters), which removes the deprecated Anthropic temperature parameter and covers this failure path.