main: simplify branch diagram in CONTRIBUTING.md#5009

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ralfhandl wants to merge 3 commits intoOAI:mainfrom

ralfhandl:main-contributing-simplify-branch-diagram

Commits on Oct 2, 2025

Simplify branch diagram
ralfhandl
committed

Commits on Oct 4, 2025

Typo
ralfhandl
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Commits on Oct 5, 2025

schemas are not in main and not synced between vX.Y-dev branches
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