test(cdc): reproduce target capability metadata gap on current develop

[seonghobae]

Rebuilds the truthful CDC target-capability boundary from exact protected develop@4408b6086fd725ff1629d8f048cf28f3a2b40b1b without transferring stale evidence from #255/#308.

Exact fail-first head: 6b8caee7714fdeb57f16aa7b3688febe76e4fa8b. This intentionally adds only CdcTargetCapabilityTest: the production CdcTargetConnector at the exact base still exposes scaffoldOnly() but no machine-readable capabilities() contract, while live Kafka and JDBC-replica product paths have intentionally unwired canonical write(...) methods.

Acceptance for RED: hosted CI must reach the CDC production-boundary test and fail because CdcTargetConnector.class.getMethods() contains no capabilities method, rather than due setup/import/fixture failure. Only after exact-head RED is proven should the narrow production capability metadata be implemented. No check/review from #255, #308, or another head transfers.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4408b60 and 3407f73.

📒 Files selected for processing (7)

• cdc-service/src/main/java/com/xtrmetl/cdc/spi/CdcTargetConnector.java
• cdc-service/src/main/java/com/xtrmetl/cdc/spi/JdbcReplicaCdcTargetConnector.java
• cdc-service/src/main/java/com/xtrmetl/cdc/spi/KafkaCdcTargetConnector.java
• cdc-service/src/test/java/com/xtrmetl/cdc/spi/CdcTargetCapabilityTest.java
• etl-service/src/main/java/com/xtrmetl/etl/controller/EtlPayloadAdmissionAdvice.java
• etl-service/src/test/java/com/xtrmetl/etl/controller/EtlHttpPayloadAdmissionTest.java
• etl-service/src/test/java/com/xtrmetl/etl/controller/EtlPayloadAdmissionAdviceTest.java

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