Codex compaction never renders; the compacted branch is dead and unsafe to simply enable #1289

rollout.ts:266 returns early when payload.type is not a string, and the compacted line's payload has no type (552 local rollouts contain it; 300/300 sampled lack type), so the entry.type === 'compacted' branch (:368-392) never runs and is untested. Enabling it naively exposes two more bugs. codexCompactBoundaryEntry (:197-207) has no timestamp, so order.ts:57 sorts it to the bottom of the feed. And replacement_history repaints prompts already in the feed: 17,326 of 20,343 sampled replacement messages duplicate an earlier user message. Severity P3.

Found by the Stage 3 C8 hunt; lines are origin/main d525d45. Findings: temp/quality-loop/hunt-c8.md.

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