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

[nanotaboada]

Summary

• Expand models design decision rationale: explains why one request model
  covers both POST and PUT, and why PlayerModel was removed
• Clarify test architecture: integration tests against real SQLite DB,
  no mocking, function-scoped client fixture
• Add release tag format with the full list of valid coach names
• Tighten Agent Mode buckets with specific file references
• Add explicit commit/branch review gate: propose and wait for approval
  before running any git commands
• Add no-cross-project-justification guideline
• Update co-author template: remove Copilot line, use
  Claude Sonnet 4.6 <noreply@anthropic.com> for historical traceability

Test plan

• Verify CLAUDE.md still imports correctly via @ pointer
• Verify file renders correctly on GitHub

🤖 Generated with Claude Code

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This change is 

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: eca7dca4-a4ae-4d6c-abd5-b3c4b3f288e1

📥 Commits

Reviewing files that changed from the base of the PR and between 24da552 and ca09bda.

📒 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

• 🛠️ sync documentation: Commit on current branch
• 🛠️ sync documentation: Create PR
• 🛠️ enforce http error handling: Commit on current branch
• 🛠️ enforce http error handling: Create PR
• 🛠️ idiomatic review: Commit on current branch
• 🛠️ idiomatic review: Create PR
• 🛠️ verify api contract: Commit on current branch
• 🛠️ verify api contract: Create PR

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (24da552) to head (ca09bda).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #533   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          113       113           
=========================================
  Hits           113       113           

Components	Coverage Δ
Services	100.00% <ø> (ø)
Routes	100.00% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[nanotaboada]

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✅ Actions performed

Review triggered.

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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