pr-review.yml: upgrade review model to GLM-5.2 (MiniMax M3 fallback) and disable focus_only_on_problems (#2)

[uuta]

Summary

• Upgrade PR-Agent review routing to GLM-5.2 with MiniMax M3 fallback.
• Disable focus_only_on_problems so defensive-programming findings are not suppressed.

Changes

• Set CONFIG.MODEL to openrouter/z-ai/glm-5.2.
• Set CONFIG.FALLBACK_MODELS to openrouter/minimax/minimax-m3.
• Set pr_code_suggestions.focus_only_on_problems to false.
• Keep The-PR-Agent/pr-agent pinned to v0.39.0 commit 8e4d32e5497defd43c023a404f73560c62728961 after checking the latest release.

Verification

• git diff --check
• YAML parsed successfully with Ruby Psych
• actionlint is not installed in the workspace
• Consumer-repository blackbox verification is deferred until after merge per issue contract

Closes #2