[BUGFIX] Improve PlantumlRenderer robustness and temp file cleanup#1281

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CybotTM wants to merge 3 commits intophpDocumentor:mainfrom

CybotTM:fix/plantuml-renderer-robustness

Commits on Jan 7, 2026

Commits on Jan 8, 2026

refactor: Extract ensureDirectoryExists helper method
CybotTM
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