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Michael Bolin
8042485601
Record the initial AutoCompactWindowIds window_id in session_meta.context_window so JSONL tailers can observe the first context window before any compaction item exists. Thread creation now requires an initial_window_id string, while rollout JSONL keeps that value under the context_window namespace without writing derived chain fields for the initial window. Resume reconstruction derives window 0 state from that initial_window_id when no compaction window metadata exists. Fork reconstruction ignores copied parent session_meta.context_window values so the fork keeps its own fresh initial window id, and legacy compactions without window_number continue to use compaction-count fallback accounting. Verification: - just test -p codex-protocol - just test -p codex-rollout recorder_materializes_on_flush_with_pending_items - just test -p codex-core reconstruct_history_restores_initial_window_from_session_meta - just test -p codex-core reconstruct_history_prefers_compacted_window_over_session_meta - just test -p codex-core reconstruct_history_preserves_legacy_compaction_count_with_session_meta_window - just test -p codex-core record_initial_history_forked_ignores_parent_session_meta_window - just test -p codex-thread-store - just test -p codex-state - just test -p codex-app-server thread_read_returns_summary_without_turns - just test -p codex-rollout persistence_metrics - just fix -p codex-protocol -p codex-rollout -p codex-thread-store -p codex-core -p codex-app-server - just fix -p codex-core -p codex-rollout