docs: mention Playground and downstream users organized by usage level#364

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Copilot wants to merge 3 commits intomainfrom

copilot/mention-playground-in-docs

Commits on Feb 22, 2026

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Copilot
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docs: mention Playground and downstream users in docs

Copilot
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strawgate
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docs: swap heavy/light user tiers — strawgate/py-key-value is heavy, beats/integrations are light

Copilot
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strawgate
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