feat: coordinate concurrent CBM sessions #924

Job	Run time
changes	5s
security / license-gate	3m 27s
lint / lint	9m 33s
security / codeql-gate	12m 41s
security / security-static	24s
pr-smoke (ubuntu-latest)	6m 26s
pr-smoke (windows-latest)	6m 38s
pr-smoke (macos-14)	8m 20s
test / setup-matrix	4s
test / test-tsan	3m 4s
test / test-windows-guards	3m 2s
test / test-windows (windows-latest, CLANG64, x86_64)	2m 55s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	2m 53s
test / test-unix (macos-15-intel, cc, c++)	2m 58s
test / test-unix (ubuntu-latest, gcc, g++)	2m 57s
test / test-unix (macos-14, cc, c++)	2m 58s
ci-ok	4s
	1h 8m 29s

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