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User requirement (non-negotiable): the project must stay first-class compatible with a Windows host permanently — Phase B adds Linux *alongside* Windows, never replacing/degrading it. - implementation-plan-A-B §2: categorical-constraint banner; B8 decommissioning cancelled (kept only as historical record); master checklist B8 row updated. - PhaseB-user-checklist: Passo 9 (B8) cancelled -> dual-host kept; Passo 8 no longer a decommission gate; tracking table + closing note updated. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>