[jonathanpeppers]

Stacked on #13525. This layer contains no manifest deletion or generator behavior fix.

AssemblyModifierPipeline still wrote the process-wide Java naming policy after its naming consumers were removed. Delete that write and unused task input. Pass policy explicitly in the binding generator, retaining its existing LowercaseCrc64 behavior, and ban the implicit-policy APIs in both build projects.

Keep existing public naming overloads for runtime and external tooling callers. Add one focused test showing explicit policy calls ignore changes to global state. Task MT remains disabled.

Local validation: SDK build and 112 tests passed

Commands used this worktree's pinned SDK and rebuilt outputs:

.\bin\Debug\dotnet\dotnet.exe test tests\Java.Interop.Tools.JavaCallableWrappers-Tests\Java.Interop.Tools.JavaCallableWrappers-Tests.csproj -v:minimal -nr:false
# Passed: 21 tests.

.\bin\Debug\dotnet\dotnet.exe test tests\generator-Tests\generator-Tests.csproj -v:minimal --filter 'FullyQualifiedName~CodeGeneratorTests|FullyQualifiedName~ManagedTests' -nr:false -p:JavaSdkDirectory=D:\android-toolchain\jdk-21
# Passed: 91 tests.

.\dotnet-local.cmd build Microsoft.Android.slnx -m:4 -nr:false -v:minimal -p:AndroidSdkDirectory=D:\android-toolchain\sdk -p:AndroidNdkDirectory=D:\android-toolchain\ndk -p:JavaSdkDirectory=D:\android-toolchain\jdk-21
# Passed: 0 errors; 28 existing warnings.

The first parallel test-build attempt hit a shared-output file lock; the naming suite passed when rerun after the generator build.

Host-only app checks also passed for both supported policies:

$app = 'C:\Users\jopepper\.copilot\session-state\e8665303-0f94-4ad8-8f58-138d624db48c\files\naming-audit\app\NamingPolicyProbe.csproj'
foreach ($policy in @('LowercaseCrc64', 'Crc64')) {
    .\dotnet-local.cmd build $app -t:Rebuild "-p:AndroidPackageNamingPolicy=$policy" -p:AndroidSdkDirectory=D:\android-toolchain\sdk -p:AndroidNdkDirectory=D:\android-toolchain\ndk -p:JavaSdkDirectory=D:\android-toolchain\jdk-21 -nr:false -v:minimal
}
# Both passed. Java packages and matching manifest activity names remained
# crc640607b65c3a40cd67 and scrc64ca4c22b77fd46e81 respectively.

Inspection of 253 rebuilt SDK tool assemblies found no path from their naming calls to the static policy getter. No device tests were run; this changes host build tools only.

[jonathanpeppers]

This was static state that wouldn't work under -mt.

[Copilot]

🟢 Approval recommended

No active review issues are recorded for the changes isolating Java naming policy from process-wide state.

No open issues 🎉

What changed in this PR

Isolates Java naming policy in host build tools from process-wide state, building on the manifest cleanup in #13525 while preserving existing public naming overloads.

Changes:

• Removes the unused naming-policy task input and global-state write.
• Passes LowercaseCrc64 explicitly in the binding generator and shares its type-resolution cache.
• Adds analyzer guards against implicit-policy APIs and a regression test for explicit-policy isolation.

File	Description
tests/​Java.Interop.Tools.JavaCallableWrappers-Tests/​Java.Interop.Tools.JavaCallableWrappers/​JavaNativeTypeManagerTests.cs	Tests that explicit naming policy ignores global-state changes.
src/​Xamarin.Android.Build.Tasks/​Xamarin.Android.Common.targets	Stops passing the unused naming-policy task input.
src/​Xamarin.Android.Build.Tasks/​Xamarin.Android.Build.Tasks.csproj	Preserves inherited warnings-as-errors settings.
src/​Xamarin.Android.Build.Tasks/​Tasks/​AssemblyModifierPipeline.cs	Removes the policy input and process-wide mutation.
src/​Java.Interop.Tools.TypeNameMappings/​Java.Interop.Tools.TypeNameMappings/​JavaNativeTypeManager.cs	Adds explicit-policy overloads while retaining existing APIs.
src/​generator/​Java.Interop.Tools.Generator.Importers/​CecilApiImporter.cs	Routes type resolution through the shared cache.
src/​generator/​generator.csproj	Enables banned-API analyzer rules.
src/​generator/​CodeGenerator.cs	Uses explicit naming policy, shares the cache, and removes redundant resolution.
src/​generator/​CodeGenerationOptions.cs	Provides the shared type-resolution cache.
build-tools/​banned-apis/​BannedSymbols.txt	Bans global naming-state access and implicit-policy APIs in consuming build projects.

_{Review effort: Balanced}