Slim down CLAUDE.md to project-specific guardrails

[lukaszlenart]

Summary

• Remove generic architecture descriptions, common patterns, and technology lists that Claude already knows from training
• Keep only build commands, project-specific traps (javax.servlet, OGNL sandbox, RAT headers), and module layout
• Reduce from ~160 lines to ~35 lines

Based on CLAUDE.md benchmark results showing that generic instructions degrade performance on bug-fix and code-generation tasks, while project-specific guardrails raise worst-case scores.

Test plan

• Verify Claude Code still picks up build commands and project rules from the slimmed file
• Confirm no project-specific traps were lost (javax.servlet, OGNL security, RAT headers, plugin descriptors)

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate failed

Failed conditions
24 Security Hotspots
42.5% Coverage on New Code (required ≥ 80%)
3.4% Duplication on New Code (required ≤ 3%)
E Security Rating on New Code (required ≥ A)
E Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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