Unconditionally stop early_cpufj if launched

[vitor1001]

If early_cpufj was started, it should be stopped and joined regardless of whether presolve finished with a result or failed/timed out, matching the behavior of early_structural.

Full disclosure: done with the help of Gemini AI.

Description

Issue

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 2909393 and a00892d.

📒 Files selected for processing (1)

• cpp/src/mip_heuristics/solve.cu

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📝 Walkthrough

Walkthrough

Changes

Early CPUFJ cleanup

Layer / File(s)	Summary
Early CPUFJ lifecycle cleanup cpp/src/mip_heuristics/solve.cu	The solve path now stops and releases early CPUFJ whenever it was created, including runs without completed presolve.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to a0089

Launched early CPUFJ work is now stopped and joined regardless of presolve outcome, preventing lifecycle cleanup from being skipped. No actionable merge-readiness risk remains.

Suggested reviewers: aliceb-nv

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains that launched early_cpufj processes must be stopped and joined in all presolve outcomes. This matches the changeset and PR objective.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: always stop early_cpufj after it is launched.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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