clang-tidy: resolve modernize-use-integer-sign-comparison

[knoepfel]

Resolve modernize-use-integer-sign-comparison clang-tidy warnings.

• Code quality: Resolved the modernize-use-integer-sign-comparison clang-tidy warning in the unsigned-long conversion helper, with explanatory comments and a targeted suppression for the (unsigned long)-1 comparison.
• Documentation: Marked the clang-tidy check as addressed and recorded PR #791.

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📝 Walkthrough

Walkthrough

The unsigned conversion helper now documents and suppresses a specific sign-comparison warning, while the clang-tidy checklist records the fix as completed and links PR 791.

Changes

Clang-tidy sign comparison fix

Layer / File(s)	Summary
Unsigned sentinel comparison suppression plugins/python/src/modulewrap.cpp	Comments explain the unsigned sentinel comparison behavior, and a targeted NOLINTNEXTLINE suppresses the clang-tidy warning.
Clang-tidy checklist tracking docs/dev/clang-tidy-fixes-2026-04.md	The modernize-use-integer-sign-comparison item is marked complete and linked to PR 791.

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

Possibly related PRs

• Framework-R-D/phlex#742: Touches the same conversion helper with clang-tidy-related edits.
• Framework-R-D/phlex#771: Modifies related unsigned conversion and sentinel handling.
• Framework-R-D/phlex#772: Updates the same clang-tidy checklist documentation.

Suggested reviewers: beojan

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: fixing clang-tidy's modernize-use-integer-sign-comparison warnings.
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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #791      +/-   ##
==========================================
- Coverage   84.06%   83.96%   -0.10%     
==========================================
  Files         172      172              
  Lines        7235     7235              
  Branches      850      850              
==========================================
- Hits         6082     6075       -7     
- Misses        876      880       +4     
- Partials      277      280       +3     

Flag	Coverage Δ
scripts	80.09% <ø> (ø)
unittests	85.90% <ø> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
plugins/python/src/modulewrap.cpp	75.35% <ø> (-0.13%)	⬇️

... and 2 files with indirect coverage changes

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