Retain main's composer, work-log, settings, mobile and performance changes through c8f77e0d441 while preserving v2 runs, queued messages, provider handoffs and durable history.

Port native compaction and logout, asynchronous Codex questions, provider usage accounting, automatic settlement and PR refresh into the v2 services. Bound live event retention during replay and delivery, measure thread replay before decoding, and read checkpoint metadata without loading transcripts or patches.

Keep main migrations through 047 and move the v2 migrations to 048–058. Preserve the existing branch history and the pre-rebase backup.

Model: GPT-6. Harness: Codex.