Lift the netstandard2.0 floor off the tooling stack via an out-of-process MSBuild bridge#447

Draft

ChrisonSimtian wants to merge 10 commits into

Fallout-build:mainfrom

ChrisonSimtian:tooling/lift-ns20-floor

Commits on Jun 30, 2026

Record ADR-0009: lift the netstandard2.0 floor via an out-of-process MSBuild bridge

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Extract the MSBuild task logic into a net10 Fallout.MSBuildTasks.Engine

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Add the net10 worker + shared JSON protocol for the MSBuild bridge

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Add the net472 ToolTask bridge; route worker diagnostics through streams

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Drop the netstandard2.0 floor: net10 in-proc tasks + runtime-switched .targets

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Package the net472 bridge + net10 worker into the consumer build\netfx folder

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Serialize the worker protocol with DataContractJsonSerializer so the net472 bridge loads

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Add MSBuild bridge smoke-test runbook

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Add worker-protocol specs: round-trip + no-System.Text.Json dependency

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Update solution-generator snapshot for the new Protocol.Specs project

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