Parse stringified tool-call input before Zod validation #6219

Job	Run time
build-and-check	2m 36s
test-integration-packages/internal	1m 13s
test-integration-packages/billing	1m 9s
test-integration-web	52s
test-integration-cli	50s
test-integration-packages/agent-runtime	40s
test-integration-sdk	1m 24s
test-integration-common	46s
test-common	42s
test-packages/internal	58s
test-packages/agent-runtime	45s
test-packages/billing	40s
test-.agents	42s
test-sdk	40s
test-web	53s
test-cli	57s
	15m 47s

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