DemoUseSessionMessageHost now reads ShellProgress / NcDiagnosticProgress / StepDiagnosticProgress (severity + id + notification, with the per-kind NC-line / step anchors). Drop DemoUseSessionMessageHost2 — its premise (reading MachiningStep objects out of the mixed message list) dissolves under the partition; step-data demos live in ShowStepPresent and SessionStepBuilt. DemoUseMachiningProject's abnormal-message log now subscribes the three sinks' MessageAdded events (shell via the OnShellMessageAdded app-lifetime bridge). Part of MixedProgress0 retirement (migration P6). Build x64 green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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