feat(etl): rebuild replay on refreshed cancellation stack

[seonghobae]

Stack repair

This Draft repairs the next invalid durable-job boundary without rewriting old PR #148. Its immediate predecessor is refreshed cancellation PR #254 at exact head 1fd2691dde1ebfd235c53703e6018eee11249f04; old #148 still targets the obsolete #147 branch and therefore cannot prove ancestry from the refreshed cancellation implementation. No #148 check, review, approval, status or synthetic-merge evidence transfers.

TDD phase

Exact first head 121654bfa463f90e2d64222f9ca60f1750a33e0e adds only EtlJobReplayBoundaryTest from the preserved replay work. The test reaches the production replay boundary by requiring EtlJobReplay and EtlJobReplayService, which are intentionally absent on the refreshed cancellation ancestry. The required first hosted result is RED at missing replay production types/contract after normal production compilation; setup, dependency, fixture or runner failure does not qualify.

After a valid RED, rebuild only the bounded replay production surface and then the persistence/state tests from #148 through auditable GREEN commits, proving exact file/semantic preservation before considering #148 superseded. Do not claim the larger obsolete #135 replay design, migrations, HTTP exposure or release semantics that #148 itself had not rebuilt.

No force-push, destructive rebase, ours/theirs shortcut, gate weakening, stale-evidence transfer, protection bypass or cross-repository write is permitted.

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