fix: serve public A2A agent card at /a2a/card on Agent Runtime - #7094
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Deployed A2A agents on Agent Runtime returned 404 for GET .../a2a/card and .../a2a/v1/card because the A2aAgent template never wired the public agent card routes. This fix registers them in both vertex ai and agentplatform A2aAgent template copies so the public card is served at both paths. PiperOrigin-RevId: 970387377
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fix: serve public A2A agent card at /a2a/card on Agent Runtime
Deployed A2A agents on Agent Runtime returned 404 for GET .../a2a/card and
.../a2a/v1/card because the A2aAgent template never wired the public agent card
routes.
This fix registers them in both vertex ai and agentplatform A2aAgent template
copies so the public card is served at both paths.