Stop treating partially-captured oldest timestamp groups (including Arc 10-pulls) as a special "incomplete" case. All decoded rows are now exported and marked with stable UIDs; the previous INCOMPLETE_* warnings and related console hint logic were removed. annotate_groups and annotate_arc_groups were simplified to always set uid_status="stable" and export_record=True, and arc_stability_warnings was deleted. CLI, live capture runner, console, tests, docs and mappings were updated to reflect the new behavior and to remove emission/handling of those informational warnings.
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