docs: PRD for A2A protocol 0.3 backward compatibility layer#785

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Commits on Apr 9, 2026

docs: add PRD for A2A protocol 0.3 backward compatibility layer

jmesnil
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claude
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docs: add user experience, error mapping, and server-common notes to 0.3 compat PRD

jmesnil
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claude
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docs: add agent card design decision to 0.3 compat PRD

jmesnil
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claude
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