Tip: Codex 0.155.0 pins reasoning effort while config overrides are active and resets it after a successful compaction

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Two commits change how effort behaves across long sessions: #43795 pins request reasoning effort while configuration overrides are active, and #43796 preserves reasoning effort through compaction then resets it on success. Previously a compaction could silently drop you back to a default effort mid-task, which is exactly the point in a long run where you are least likely to notice the quality change. A companion commit batches non-user history eviction to preserve Guardian transcript deltas (#43798), so the safety reviewer keeps its evidence when history is trimmed.