move tool definitions to agent-runtime #3935

Job	Run time
build-and-check	2m 35s
test-cli	29s
test-backend	42s
test-.agents	37s
test-npm-app	37s
test-integration-backend	35s
test-packages/agent-runtime	29s
test-web	32s
test-integration-web	30s
test-integration-cli	28s
test-integration-common	30s
test-common	31s
test-integration-packages/agent-runtime	30s
test-integration-npm-app	29s
test-integration-.agents	29s
	10m 3s

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