ci: Add snapshot PR review workflow and skill

.agents/skills/snapshot-codereview-guide.md

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+---
+name: snapshot-codereview-guide
+description: Snapshot code review guidelines
+triggers:
+  - /codereview
+---
+
+# SQRL Snapshot Code Review Guidelines
+
+# Repository Code Review Guidelines
+
+You are reviewing code for SQRL. Follow these guidelines:
+
+## Review Decisions
+
+### When to APPROVE
+- Change is not touching snapshot files
+- Change that contains snapshot updates and snapshot content update looks good based on the core logic changes 
+
+### When to COMMENT
+- A snapshot change contains updates that are undesirable
+- A previously successful snapshot now contains a failure and the core logic does not indicate why
+- A previously failing snapshot now contains a success and the core logic does not indicate why
+
+## Core Principles
+
+1. **SQRL Snapshot Files**: Any file with a `.snapshot` extension that contains the snapshot data
+2. **Unit Test Snapshot Files**: Any `.txt` files under the `sqrl-testing/sqrl-testing-integration/src/test/resources/snapshots/com/datasqrl` directory
+
+## What to Check
+
+- **[Failing Snapshot]**: A previously succeeding snapshot now contains a failure and the core logic changes do not indicate that
+- **[Succeeding Snapshot]**: A previously failing snapshot now contains a success and the core logic changes do not indicate that
+- **[Snapshot Data Changes]**: A snapshot file contains updates (e.g., new data columns, changed format) that are not related to the core logic

.github/workflows/snapshot-pr-review.yml

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+name: Snapshot PR Review
+
+on:
+  pull_request_target:
+    types: [ opened, ready_for_review, labeled, review_requested ]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  pr-review:
+    if: |
+      (github.event.action == 'opened' && github.event.pull_request.draft == false)
+      || github.event.action == 'ready_for_review'
+      || github.event.label.name == 'review-this'
+      || github.event.requested_reviewer.login == 'openhands-agent'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run PR Review
+        uses: OpenHands/extensions/plugins/pr-review@main
+        with:
+          llm-model: openai/gpt-5.5
+          llm-api-key: ${{ secrets.LLM_API_KEY }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}