fix: add trap-guarded mktemp helper in test-pr-task-check.sh

[alex-solovyev]

Summary

Fixes quality-debt from PR #1260 review feedback (issue #3691).

• Introduces run_with_temp_todo() helper that encapsulates mktemp creation, trap EXIT registration, test execution, and cleanup — satisfying the style-guide requirement that all mktemp calls have a trap for cleanup (style-guide line 33)
• Replaces all 6 inline mktemp/rm -f blocks in Test Group 5 with calls to the new helper
• All 25 test cases continue to pass; ShellCheck reports zero violations

The other three findings from the issue (verbose() SC2015 pattern, check_pr_task_id missing return 0 × 2) were already fixed in a prior commit on main.

Closes #3691

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🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 413 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Fri Mar 13 02:44:46 UTC 2026: Code review monitoring started
Fri Mar 13 02:44:47 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 413

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 413
• VULNERABILITIES: 0

Generated on: Fri Mar 13 02:44:49 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud