Codex 0.155.0 ships memory v2 behind configurable memory versions with isolated storage and dual writing

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The 0.155.0 commit log shows a full second-generation memory system landing incrementally: configurable memory versions with isolated storage (#43797), prioritizing human evidence in v2 extraction (#43799), summary-only extraction (#43800), extraction chunking moved into the memory writer (#43808), dedicated v2 consolidation and read prompts (#43813), and dual writing with a v2 readiness report (#43827). None of this appears in the release's New Features section, only in the commit list. The dual-write plus readiness-report shape is the safe pattern for migrating any agent memory store: write both, compare, cut over only when the report says the new one is complete.