Fix vendored PSLP writing a stray infeasible-message printf to native stdout

[ramakrishnap-nv]

Summary

• run_presolver() in vendored PSLP (dance858/PSLP, pinned at v0.0.11) prints "PSLP declares problem as infeasible[.| or unbounded.]" unconditionally, unlike every other console message in that function, which are all gated behind stgs->verbose (print_start_message, print_end_message, etc).
• cuOpt already sets verbose = false when calling PSLP (third_party_presolve.cpp) specifically to keep it silent -- this one message was just missed upstream, so it writes straight to the process's native stdout regardless.
• Found while investigating the Java bindings' "Corrupted channel" Surefire crash on Explore self-contained Java classifier JARs with a statically linked libcuopt #1818: a raw native write there bypasses System.out and corrupts Maven Surefire's forked-JVM protocol, which also multiplexes over stdout. Confirmed directly by reading the exact corrupted text out of a captured Surefire .dumpstream artifact.
• The infeasible/unbounded status itself is unaffected by this fix -- it already flows back to the caller through run_presolver()'s typed return value, not by parsing this printed text.

Fix

Filed and fixed upstream: dance858/PSLP#55. Until a release containing it ships, pin cpp/CMakeLists.txt's GIT_TAG past v0.0.11 directly at the merge commit, rather than patching the vendored source locally.

Test plan

• Confirmed via a captured .dumpstream artifact that this exact message was the corrupted text.
• ProblemIntegrationTest's infeasible-solve test case (Java bindings) exercises this code path directly.
• CI passes clean.

Split out of #1825, which originally carried this alongside an unrelated fix (routing cuOpt's own console logging through System.out).

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📝 Walkthrough

Walkthrough

Changes

PSLP dependency update

Layer / File(s)	Summary
Update PSLP reference cpp/CMakeLists.txt	PSLP changes from tag v0.0.11 to commit 12d37dd9ab5ee848b3ec5da17f4cf8e805d58cd6. Comments document the included stdout-suppression fix.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to e2d60

This change stops an unintended PSLP status message from being written to native stdout, preventing interference with Java test-process communication; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: tmckayus, akifcorduk, hlinsen

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: preventing the vendored PSLP dependency from writing an unwanted infeasibility message to native stdout.
Description check	✅ Passed	The description directly explains the stdout issue, its impact on Java bindings, the upstream fix, the dependency pin change, and the test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pslp-infeasible-message-fix

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CI Test Summary

✅ All 31 test job(s) passed.

[ramakrishnap-nv]

/merge