Fix cold-start codegen races without requiring -m:1.

AGENTS.md

@@ -25,10 +25,6 @@ CI runs on Windows and Ubuntu. See .github/workflows/ci-cd.yml:
 
 Always mirror this sequence when validating a change locally.
 
-Use `dotnet build -m:1` for a cold-start build (a tree with no generated sources yet).
-Parallel builds race on the generated sources and fail with `LcmGenerate` or `IdlImp`
-errors. Plain `dotnet build` is fine once those sources exist.
-
 ### Tests per README (not validated here)
 - Windows, ReSharper: open LCM.sln and “Run Unit Tests”.
 - Windows, no ReSharper: use MSBuild, then run nunit3-console.exe from artifacts/Debug/net462.

README.md

@@ -29,22 +29,18 @@ with language and culture data, including anthropological, text corpus, and ling
 
     On Windows:
 
-    - Run `dotnet build -m:1` to build the liblcm library. Alternatively, `LCM.sln` can be
+    - Run `dotnet build` to build the liblcm library. Alternatively, `LCM.sln` can be
       built from within Visual Studio.
 
     On Linux:
 
-    - Source `environ`, then run `dotnet build -m:1` to build the liblcm library.
-
-Use `-m:1` for a cold-start build (a fresh clone or worktree, with no generated sources
-yet). Parallel builds race on the generated sources. Plain `dotnet build` is fine once
-those sources exist.
+    - Source `environ`, then run `dotnet build` to build the liblcm library.
 
 By default, this will build liblcm in the Debug configuration.
 To build with a different configuration, use:
 
 ```bash
-dotnet build -m:1 --configuration (Debug|Release)
+dotnet build --configuration (Debug|Release)
 ```
 
 ## Debugging

src/SIL.LCModel.Core/GenerateKernelCs.proj

@@ -23,7 +23,9 @@
 
 		<UsingNamespaces Include="SIL.LCModel.Utils" />
 	</ItemGroup>
-	<Target Name="GenerateKernelCs" Inputs="@(KernelIdhFiles)" Outputs="$(OutDir)KernelInterfaces/FwKernelTlb.json">
+	<!-- No Inputs/Outputs: the parent GenerateKernelCs target already decides when to run.
+	     Skipping here when FwKernelTlb.json exists leaves Kernel.cs missing after a clean of generated sources. -->
+	<Target Name="GenerateKernelCs">
 		<Exec Command="$(PreprocessCommand) $(KernelIdl) > $(PreprocessedKernelIdl)" />
 		<IdlImp Output="KernelInterfaces/Kernel.cs"
 				Namespace="SIL.LCModel.Core.KernelInterfaces"

src/SIL.LCModel.Core/SIL.LCModel.Core.csproj

@@ -6,6 +6,8 @@
     <Description>The liblcm library is the core FieldWorks model for linguistic analyses of languages. Tools in this library provide the ability to store and interact with language and culture data, including anthropological, text corpus, and linguistics data.
 SIL.LCModel.Core provides a base library with core functionality.</Description>
     <LangVersion>latest</LangVersion>
+    <!-- Inner TFMs share Kernel.cs in the project tree; parallel inner builds race on IdlImp. -->
+    <InnerBuildInParallel>false</InnerBuildInParallel>
   </PropertyGroup>
 
   <ItemGroup>

src/SIL.LCModel/SIL.LCModel.csproj

@@ -6,6 +6,8 @@
     <Description>The liblcm library is the core FieldWorks model for linguistic analyses of languages. Tools in this library provide the ability to store and interact with language and culture data, including anthropological, text corpus, and linguistics data.
 	SIL.LCModel is the main library.</Description>
     <Product>liblcm</Product>
+    <!-- Inner TFMs share Generated*.cs in the project tree; parallel inner builds race on LcmGenerate. -->
+    <InnerBuildInParallel>false</InnerBuildInParallel>
   </PropertyGroup>
 
   <ItemGroup>