repair(cdc): replay Kafka retry validation on live develop

[seonghobae]

Rebuilds the #250 / #251 retry-configuration fix directly from live protected develop@106add38465937f6eb4e4accc185fd30aab4446f because #251 no longer descends from the current protected tip. Keep Draft.

TDD restart:

• exact base at branch creation: 106add38465937f6eb4e4accc185fd30aab4446f;
• test-only RED head: 773634c2d4bbe94f3af4c7ac0ad67d07afa99b41;
• production boundary under test: KafkaConfig.kafkaListenerErrorHandler(...);
• fail-first assertions require negative retry backoff / retry attempts to be rejected with stable configuration-key diagnostics.

The old #251 production behavior is not yet copied into this replacement. First require hosted RED on this exact ancestry, then apply the smallest GREEN and prove preservation before closing #251. Shared coverage/scanner/literal-source/independent-review gates remain separate blockers and no prior-head evidence transfers.

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📥 Commits

Reviewing files that changed from the base of the PR and between ae4efe6 and 13f64c5.

📒 Files selected for processing (2)

• cdc-service/src/main/java/com/xtrmetl/cdc/config/KafkaConfig.java
• cdc-service/src/test/java/com/xtrmetl/cdc/config/KafkaConfigTest.java

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