Prefer SCM CI failure summaries when composing ci-failed agent messages, including failed job/step, run URL, and log tail. Fall back to check names/statuses for SCM plugins without getCIFailureSummary, and remove the generic default ci-failed text so default handling relies on the lifecycle-composed payload.
State invariants preserved: this only changes ci-failed reaction payload composition and dispatch hashing. It does not change lifecycle status decisions, state-machine transitions, ci-failed persistence, retry/escalation thresholds, or stable-passing tracker reset semantics.
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