docs(copilot): unify instructions as canonical single-file format

[nanotaboada]

Consolidate .github/copilot-instructions.md and AGENTS.md into a single always-on file with a consistent section order (Overview, Tech Stack, Structure, Coding Guidelines, Commands, Agent Mode).

• Replace two-file system with one canonical copilot-instructions.md
• Absorb AGENTS.md content (autonomy levels, workflows) into Agent Mode

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This change is 

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✨ Finishing Touches

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• Commit unit tests in branch docs/unify-copilot-instructions

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (5911d82) to head (c175a2f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
=======================================
  Files           3        3           
  Lines         116      116           
=======================================
  Hits          104      104           
  Misses         12       12           

Components	Coverage Δ
Services	79.31% <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.

[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

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[nanotaboada]

@coderabbitai review

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✅ Actions performed

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