refactor: make PR review output more concise

[Spiev]

Summary

• Add system prompt enforcing brevity (no filler, no praise, no pleasantries)
• Dependabot PRs: replace verbose text with compact table format (Type/Risk/Change/Security/Action)
• Feature PRs: reduce 6-category checklist to focused bullet points (Summary/Security/Issues/Suggestions)
• Add mandatory Security section to both review types — always explicitly shown
• Lower max_tokens from 1500 → 300 (Dependabot) / 800 (Feature)

Test plan

• Trigger review on a Dependabot PR and verify table format
• Trigger review on a feature PR and verify concise output with Security section

🤖 Generated with Claude Code

[github-actions]

🔍 Code Review (by Claude)

Issues

• Incomplete diff: The provided code change is truncated mid-line (Descr). Cannot verify the full feature PR prompt structure.

Security Review

• No issues in the visible code (system prompt definition, table format changes, prompt restructuring).

Notes

• Token reduction (1500→300 for Dependabot, 1500→800 for feature) may be too aggressive. 300 tokens could truncate table responses or complex security findings.
• Mandatory Security section is good practice.
• Table format for Dependabot reviews improves readability.
• Missing test plan checkbox completion - ensure actual testing happens.

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Review generated by Claude AI. Please use your judgment for final approval.