fix(mcp): serialize ADR access across processes #573

Job	Run time
changes	4s
lint / lint	5m 0s
security / security-static	28s
security / codeql-gate	38m 18s
security / license-gate	2m 41s
pr-smoke (ubuntu-latest)	3m 48s
pr-smoke (windows-latest)	6m 44s
pr-smoke (macos-14)	2m 59s
test / setup-matrix	3s
test / test-windows-guards	6m 3s
test / test-windows (windows-latest, CLANG64, x86_64)	4h 0m 15s
test / test-unix (macos-15-intel, cc, c++)	18m 47s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	1h 11m 21s
test / test-unix (ubuntu-latest, gcc, g++)	12m 45s
test / test-unix (macos-14, cc, c++)	10m 58s
ci-ok	2s
	7h 0m 16s

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