feat(etl): rebuild cancellation on refreshed conditional-status stack

[seonghobae]

Stack repair

This Draft repairs the first currently invalid durable-job boundary. Fresh ancestry proved current predecessor PR #146 advanced to 894e1fdcb3ad212f35ae0b8c7665b6e495e2eb87, while old cancellation PR #147 remains rooted at historical predecessor 9e4d69e0bb33ab57627c697a5d028b5309eca2bb and is now diverged (ahead 31 / behind 6, merge base 9e4d69e...). The six predecessor commits are confined to the CDC engine health-indicator/test path, while #147's cancellation delta is ETL/docs-only, so this replacement starts from the exact current #146 head rather than rewriting history.

TDD phase

Exact current replacement head f50be481b2b19e6fb566e5430f2d6aac6437fdd4 contains only the first cancellation result contract test. Production EtlJobCancellation and the CANCELLED status contract are intentionally absent on this ancestry, so the expected first hosted result is RED at the missing cancellation production boundary. Setup/import/dependency/runner failure will not count as valid RED.

After valid RED, rebuild the proven cancellation slice through narrow auditable GREEN commits, then restore concurrency/migration/controller/service/documentation tests and prove unique-work equivalence to #147 before considering #147 superseded. No checks/reviews/approvals from #147 transfer. Do not repair downstream replay #148 until this boundary is stack-valid and verified.

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

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