quick fix: prompt codebuff to never spawn the context-pruner agent #5253

Job	Run time
build-and-check	2m 30s
test-packages/agent-runtime	51s
test-.agents	37s
test-packages/internal	41s
test-cli	1m 9s
test-integration-sdk	1m 4s
test-common	42s
test-integration-web	39s
test-integration-packages/internal	40s
test-sdk	49s
test-integration-packages/agent-runtime	40s
test-web	47s
test-integration-cli	39s
test-packages/billing	39s
test-integration-.agents	1m 19s
test-integration-common	46s
test-integration-packages/billing	46s
	15m 18s

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