clang-tidy: resolve bugprone-random-generator-seed

[greenc-FNAL]

Suppresses the bugprone-random-generator-seed warning on the intentional srand(std::time(nullptr)) call in test/form/writer.cpp, and tracks the fix in the April 2026 clang-tidy progress report.

Changes

• test/form/writer.cpp: Add // NOLINT(bugprone-random-generator-seed) inline suppression; add explicit <ctime> include; use std::time(nullptr) instead of time(0).
• docs/dev/clang-tidy-fixes-2026-04.md: New monthly report tracking outstanding clang-tidy warnings with bugprone-random-generator-seed marked as resolved ([x]).

[Copilot]

Pull request overview

This PR addresses a clang-tidy bugprone-random-generator-seed warning in a test by adding an in-line suppression and documenting outstanding clang-tidy items in a new monthly report.

Changes:

• Add a NOLINT(bugprone-random-generator-seed) suppression to the srand(time(0)) call in test/form/writer.cpp.
• Add a new developer document tracking clang-tidy warning counts for April 2026.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
test/form/writer.cpp	Adds commentary + clang-tidy suppression for srand(time(0)).
docs/dev/clang-tidy-fixes-2026-04.md	Introduces an April 2026 clang-tidy fixes tracking checklist.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   85.58%   85.47%   -0.12%     
==========================================
  Files         142      142              
  Lines        3586     3586              
  Branches      615      615              
==========================================
- Hits         3069     3065       -4     
  Misses        311      311              
- Partials      206      210       +4     

Flag	Coverage Δ
unittests	85.47% <ø> (-0.12%)	⬇️

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