Stability checkpoint — svc 1.0.53 (wave 4 SB3 surgical fixes) Captures !194 (wave 4) : - SB3 RestTestClient stale exclude path (com/example/customerservice → com/mirador/customer) - SB3 BOM precedence : explicit version pins for spring-boot-test-* (forces 3.4.5 over parent 4.0.5 for test-autoconfigure deps) - pre-java25 overlay copy added to SB3 antrun config (matches compat profile) Local validation pre-merge : - ./mvnw -Dsb3 test-compile → reduces 4 compile errors to 1 (CustomerControllerTest constructor mismatch, deferred wave 5) - ./mvnw -Dcompat test-compile → green - ./mvnw -Dcompat -Djava17 test-compile → green Compat re-trigger needed post-tag to validate. SB3 cells expected to make further progress (PATH_CUSTOMERS + SecurityConfig throws + RestTestClient exclude + BOM precedence + pre-java25 overlay all in play). Remaining structural debt : CustomerControllerTest constructor diff (10 vs 6 params between SB3 overlay and main) — multi-hour refactor deferred to wave 5.