Add minimum Gradle compatibility functional test

Upgrade Gradle to 9.4.1 and fix functional tests

Keep contribution-based assemblies on managed Sync tasks, register direct producers through ArtifactAssemblyRegistry, wire builtBy on outgoing artifacts, and cover the behavior with functional tests.

Set the project version to 0.1.0, add publication descriptions/license metadata, and keep module-level docs as compatibility pointers to the root documentation.

variants: move source set layout conventions out of model Keep GenericSourceSet convention-free and apply layout defaults from SourcesPlugin and VariantSourcesPlugin. Add compile unit layout convention and cover standalone and variant source set layouts in functional tests.

variants: expose compile unit source set specs Route variantSources selectors through CompileUnitSourceSetSpec so source set materialization keeps compile unit identity available. Add configureEach hooks and keep GenericSourceSet as a plain source set model.

variants: validate source context identities

variants: refine public API boundary

variants: stabilize artifact slot materialization

variants: enforce source configuration policies

common: extract replayable queue

Refine variant artifacts publication lifecycle- Remove assembly task access from outgoing slot publication spec- Keep whenOutgoingSlot focused on publication attributes only- Decouple materialization policy handler from artifact assemblies- Drop eager afterEvaluate outgoing configuration realization- Add reference coverage for lazy Gradle outgoing variants- Exercise primary and secondary artifact resolution without forced realization- Keep slot body customization in ArtifactAssemblySpec

Rework variant artifacts materialization model Refactor VariantArtifactsPlugin around a live outgoing artifacts context and split artifact publication into explicit internal services: outgoing variant registry, assembly binding, materialization policy hooks, primary-slot convention, and slot assembly handling. Introduce variant artifact slots as identity-first public API and expose materialized assembly handles through ArtifactAssemblies. Add replayable configuration hooks for outgoing configurations, outgoing slots, outgoing variants, and registered assemblies. Create consumable outgoing configurations per variant, bind the primary slot to the root outgoing artifact set, and publish non-primary slots as Gradle outgoing configuration variants. Add deterministic injective task names for slot assembly tasks, use Sync for directory assembly, and configure the default assembly output location under build/variant-assemblies. Make primary-slot selection finalize-on-read and provide a single-slot convention that fails when no unique default can be inferred. Mark artifact internal implementation package as non-public API.

WIP variant artifacts DSL, FilePaths traits

WIP Added ArtifactAssemblyBridge to wire variants with slot assemblies

WIP code cleanup after AI... never again!

WIP working on outgoing variant artifacts

WIP working on variants api

variants, variantSources tests

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