feat: Add enhanced PR analysis features v0.2.0

[aleksandardodevski111]

Summary

This PR adds 4 new enhanced PR analysis features to PeeR-Agent:

🧪 Test Suggestions

• Auto-detects testing framework (Jest, Mocha, Vitest, pytest)
• Identifies code changes without corresponding tests
• Generates copyable test templates

📊 Coverage Reporting

• Parses Jest/NYC JSON, lcov, and Cobertura formats
• Only runs when coverage tool is configured in project
• Shows overall percentage, line/branch coverage

💰 DevOps Cost Estimation

• Detects Terraform, CloudFormation, Docker, K8s files
• Estimates AWS resource costs using built-in pricing data
• Shows confidence level for each estimate

🖥️ CLI Display Updates

• New sections in pr-agent analyze output for all features

Changes

New Files:

• src/tools/test-suggestion-tool.ts
• src/tools/coverage-reporter.ts
• src/tools/devops-cost-estimator.ts
• CHANGELOG.md

Modified:

• src/types/agent.types.ts - Added new interfaces
• src/tools/index.ts - Exports for new tools
• src/cli/commands/analyze.command.ts - Display sections
• package.json - Version bump to 0.2.0

Testing

✅ TypeScript build passes
✅ All dependencies installed