feat: coordinate concurrent CBM sessions #943

Job	Run time
changes	4s
lint / lint	10m 47s
security / security-static	26s
security / license-gate	3m 37s
security / codeql-gate	12m 48s
pr-smoke (ubuntu-latest)	4m 18s
pr-smoke (macos-14)	6m 30s
pr-smoke (windows-latest)	9m 55s
test / test-windows-guards	1m 58s
test / test-tsan	1m 57s
test / setup-matrix	3s
test / test-windows (windows-latest, CLANG64, x86_64)	1m 49s
test / test-unix (ubuntu-latest, gcc, g++)	1m 50s
test / test-unix (macos-14, cc, c++)	1m 50s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	1m 45s
test / test-unix (macos-15-intel, cc, c++)	1m 48s
ci-ok	3s
	1h 1m 28s

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