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## Why The token-budget context currently identifies a context window by its thread-local sequence number. A UUIDv7 gives the model a stable opaque identity that remains fixed for a window and rotates when compaction or `new_context` starts the next one. ## What changed - Preserve the existing monotonic value as `window_number` and add a UUIDv7 `window_id` to `CompactedItem`. - Generate and rotate the UUID with auto-compaction window state, persist it alongside the number, and reconstruct it on resume and rollback. - Accept legacy compacted rollout records where the numeric `window_id` represented the window number. - Use the UUID only in token-budget context; existing request headers and metadata continue using `thread_id:window_number`. ## Testing - `just test -p codex-protocol compacted_item::tests` - `just test -p codex-core token_budget`