Fixed 26.08 release notes

[nguidotti]

Removed entries related with the 26.06 release or earlier. Added missing PRs.

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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• RELEASE-NOTES.md

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📝 Walkthrough

Walkthrough

Changes

26.08 Release Notes

Layer / File(s)	Summary
Improvement entries RELEASE-NOTES.md	Updated host-memory reduction entries and removed several previous improvement entries.
Bug-fix entries RELEASE-NOTES.md	Added MIP clique-cut, quadratic/QCQP, and related solver fixes. Removed superseded fixes and listed the CPU-only cuopt.routing import fix.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• NVIDIA/cuopt#1638: Both PRs update the 26.08 entries in RELEASE-NOTES.md.

Suggested labels: doc

Suggested reviewers: iroy30, tmckayus, ramakrishnap-nv

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing the 26.08 release notes.
Description check	✅ Passed	The description explains that outdated release-note entries were removed and missing pull requests were added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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