fix: persist the AgentCard on Agent Engine update() - #7065
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`_create_config` wrote `spec.agent_card` into the update request body without adding it to the update mask, so the server dropped it on the PATCH and an A2A agent's card could never change after the first deployment. Append `spec.agent_card` to the update mask whenever a card is present. Fixes #7064 PiperOrigin-RevId: 963563187
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fix: persist the AgentCard on Agent Engine update()
_create_configwrotespec.agent_cardinto the update request body without adding it to the update mask, so the server dropped it on the PATCH and an A2A agent's card could never change after the first deployment. Appendspec.agent_cardto the update mask whenever a card is present.Fixes #7064