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.