Update tutorial tests to validate objective function values

[Copilot]

• Inspect existing tutorial and case study tests
• Identify tutorial-specific preprocessing requirements
• Run baseline targeted tutorial tests and install missing test dependencies if needed
• Update tutorial tests to assert objective values using the case-study structure
• Run targeted tutorial tests and related validation
• Scan changed files for secrets and run final validation

Closes #1362

[github-actions]

🤖 CompareMPS report

✅ MPS files match

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.61%. Comparing base (4587012) to head (a5ac9d8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1633   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files          56       56           
  Lines        1874     1874           
=======================================
  Hits         1848     1848           
  Misses         26       26           

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