docs(instructions): upgrade to Claude Code-optimized agent instructions

[nanotaboada]

Summary

• Fixes structural errors in the directory tree (Profiles/ → Mappings/, ControllersTests/+ServicesTests/ → Unit/+Utilities/)
• Adds missing folders (Enums/, Extensions/, Configurations/, Middlewares/)
• Documents FluentValidation Create/Update rule set pattern with code examples
• Documents the IValidationContext Moq overload gotcha for controller tests
• Documents PlayerFakes/PlayerMocks/PlayerStubs test utilities
• Adds CD pipeline tag/stadium naming to the Never modify constraints
• Makes pre-commit step 4 explicit: dotnet csharpier .
• Updates co-author line to Claude Sonnet 4.6

Test plan

• Read through the updated instructions and verify all folder names match the actual repo structure
• Confirm code examples compile mentally against the current validator and controller tests

🤖 Generated with Claude Code

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ℹ️ Review info

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Review profile: CHILL

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Run ID: 73f47ea2-894f-4d64-94f8-b863270ed66c

📥 Commits

Reviewing files that changed from the base of the PR and between 9c2df9e and cb9e899.

📒 Files selected for processing (1)

• .github/copilot-instructions.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/upgrade-agent-instructions

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nanotaboada]

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