Include model id in system prompt #6088

Job	Run time
build-and-check	3m 11s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 21s
test-integration-packages/agent-runtime	40s
test-integration-web	42s
test-integration-sdk	1m 30s
test-cli	56s
test-integration-common	40s
test-common	45s
test-.agents	52s
test-packages/agent-runtime	47s
test-sdk	52s
test-packages/billing	47s
test-integration-cli	43s
test-packages/internal	55s
test-web	1m 5s
	16m 50s

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