Audit and Fix Concurrency Race Condition

[Snider]

This submission addresses the task of performing a concurrency and race condition audit. It includes a new AUDIT-CONCURRENCY.md file with the audit findings and a fix for a critical race condition in the PlantTreeWithTFTF job.

Fixes #47

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PR created automatically by Jules for task 10148998592936175386 started by @Snider

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✨ Finishing touches

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[github-actions]

QA Pipeline Results

Check	Status	Details
Tests	✓	207 tests, 410 assertions
PHPStan	✓	0 errors
Psalm	✗	1 issues
Code Style	✓	0 files need formatting
Security	✓	0 vulnerabilities

Artifacts

• test-results.xml - JUnit test results
• phpstan.json - PHPStan analysis
• psalm.json / psalm.sarif - Psalm analysis
• pint.json - Code style report
• audit.json - Security audit

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Generated by core php qa pipeline