[codex] overhaul Freebuff premium sessions #6403

Job	Run time
build-and-check	3m 12s
test-integration-packages/internal	1m 3s
test-integration-web	46s
test-integration-packages/billing	1m 4s
test-common	52s
test-integration-sdk	1m 17s
test-integration-common	38s
test-packages/billing	46s
test-integration-cli	48s
test-cli	52s
test-integration-packages/agent-runtime	49s
test-packages/agent-runtime	52s
test-.agents	52s
test-web	1m 41s
test-sdk	52s
test-packages/internal	51s
	17m 15s

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