Add PR-Agent + Qodo Merge dual review workflows

.github/workflows/pr-agent.yml

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+name: PR-Agent
+on:
+  pull_request_target:
+    types: [opened, ready_for_review, reopened]
+  issue_comment:
+    types: [created, edited]
+
+permissions:
+  pull-requests: write
+  issues: write
+  contents: read
+
+jobs:
+  pr-agent:
+    runs-on: ubuntu-latest
+    if: |
+      (github.event_name == 'pull_request_target' && github.event.action != 'closed') ||
+      (github.event_name == 'issue_comment' && github.event.issue.pull_request &&
+       contains(github.event.comment.body, '/describe') ||
+       contains(github.event.comment.body, '/review') ||
+       contains(github.event.comment.body, '/improve') ||
+       contains(github.event.comment.body, '/ask'))
+    steps:
+      - name: PR-Agent
+        uses: codium-ai/pr-agent@v0.38.0
+        env:
+          OPENAI_API_KEY: ${{ secrets.DEEPSEEK_API_KEY }}
+          DEEPSEEK_API_KEY: ${{ secrets.DEEPSEEK_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          github_action_config.auto_describe: "true"
+          github_action_config.auto_review: "true"
+          github_action_config.auto_improve: "false"
+          github_action_config.enable_output: "true"
+          pr_agent.extra_config: ".pr_agent.toml"

.pr_agent.toml

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+[pr_description]
+extra_instructions = """
+Focus on:
+1. What behavior changed (not just what code changed)
+2. Backend/platform impact (ROCm, Metal, CPU, NPU)
+3. Breaking API or build changes
+4. Performance implications
+Use bullet points. Keep it under 250 words.
+"""
+
+[pr_reviewer]
+extra_instructions = """
+Prioritize:
+1. Thread safety and memory correctness (C++20, raw pointers, HIP streams)
+2. Build correctness — CMakeLists.txt changes, new targets, platform guards
+3. Error handling — allocation failures, HIP errors, file-not-found?
+4. Performance — blocking calls on hot paths, unnecessary copies, missing reserve()
+5. Test coverage — do new features have corresponding tests?
+6. Backward compatibility — HTTP API, CLI interface, model format?
+
+Ignore minor style nits (naming, formatting) unless they obscure intent.
+Flag security issues (buffer overflows, unsanitized inputs) as critical.
+"""
+
+[pr_code_suggestions]
+extra_instructions = """
+Suggestions should be actionable and specific. Avoid generic advice.
+Prefer concrete rewrites over abstract critiques.
+"""
+
+[pr_questions]
+enabled = true
+
+[config]
+verbosity_level = 1
+model = "deepseek/deepseek-chat"
+fallback_models = "openai/gpt-4o"
+custom_model_max_tokens = 64000