Add note for context compacted summary not to imitate tool calls #6046

Job	Run time
build-and-check	2m 52s
test-integration-packages/internal	1m 4s
test-integration-packages/billing	1m 9s
test-integration-sdk	1m 18s
test-integration-cli	50s
test-integration-web	52s
test-integration-common	49s
test-integration-packages/agent-runtime	46s
test-packages/billing	43s
test-web	48s
test-packages/internal	52s
test-sdk	44s
test-packages/agent-runtime	48s
test-.agents	46s
test-cli	52s
test-common	47s
	16m 0s

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