…r publishing Implements the `darwin-arm64` portion of #2399. Fixes #2400. ## Summary Adds Apple Silicon macOS (`darwin-arm64`) as a supported target for the Java SDK's experimental in-process runtime, alongside the existing GNU/Linux `linux-x64` and Windows `win32-x64` targets delivered by #2301 and #2393. - Packages a macOS native classifier containing `runtime.node`, `copilot`, and `platform.properties`. - Activates and validates the `darwin-arm64` classifier automatically on Apple Silicon macOS, including when Maven runs with `-Pinprocess`. - Extends native fetch, host-validation, artifact-validation, and local-publication tests to cover Darwin artifacts and reject unsupported Intel macOS hosts. - Runs the Java in-process test suite on `macos-26` in addition to the existing Ubuntu and Windows matrix. - Builds the Darwin classifier on an Apple Silicon macOS runner and adds it to the blocking publication-assembly test. - Extends both snapshot and Maven Central release workflows so Linux, Windows, and Darwin classifiers are built on their matching native hosts and published together in one Maven deployment. - Documents Apple Silicon setup, classifier contents, supported-host behavior, and the updated ADR-007 platform status. ## User experience In-process mode remains opt-in, experimental, and unchanged for existing Linux and Windows consumers. The SDK's default connection behavior is also unchanged. An Apple Silicon macOS application enables in-process mode by: 1. Depending on `com.github:copilot-sdk-java-runtime` with classifier `darwin-arm64`, plus JNA. 2. Configuring `CopilotClientOptions` with `RuntimeConnection.forInProcess()`. The classifier JAR contains: ```text native/darwin-arm64/runtime.node native/darwin-arm64/platform.properties native/darwin-arm64/copilot ``` For SDK development on Apple Silicon, `mvn -Pinprocess clean verify` detects `darwin-arm64`, validates that the host is macOS ARM64, fetches the pinned `@github/copilot-darwin-arm64` package, packages its version-matched runtime and transitional CLI, and exercises the in-process integration suite. Intel macOS and other unsupported OS/architecture combinations fail explicit in-process host validation rather than packaging the wrong binary. During the active Rust migration, the classifier intentionally includes the version-matched `copilot` embedded-host executable in addition to `runtime.node`. It can be removed once the native runtime no longer delegates unported method bodies to the CLI. ## Packaging and publication model This extends the coordinated publication model introduced by #2393 from two native classifiers to three: | Classifier | Build host | Native contents | |---|---|---| | `linux-x64` | Ubuntu x64 glibc | `runtime.node`, `copilot`, metadata | | `win32-x64` | Windows x64 | `runtime.node`, `copilot.exe`, metadata | | `darwin-arm64` | Apple Silicon macOS | `runtime.node`, `copilot`, metadata | The macOS job builds only the `darwin-arm64` classifier and a SHA-256 manifest. The sole Ubuntu publisher then: 1. Verifies that the macOS and Windows handoffs came from the same immutable source and Maven version as the Linux build. 2. Verifies each checksum, expected filename, pinned native-runtime version, required contents, and absence of cross-classifier contamination. 3. Attaches the external Windows and Darwin classifier JARs to the Maven reactor. 4. Builds `linux-x64` locally and performs one deployment containing the neutral SDK artifacts and all three native classifiers. Using one deployment preserves a shared Maven snapshot timestamp/build number and ensures release signing covers every classifier. Snapshot and release summaries now report the build host, filename, and SHA-256 hash for all three classifiers. ## CI and safety checks - The in-process Actions matrix covers `linux-x64`, `win32-x64`, and `darwin-arm64`. - A dedicated `macos-26` job builds and validates the Darwin publication input before upload. - Blocking publication assembly downloads both external native artifacts and validates the complete signed local repository before publication workflows can drift unnoticed. - Host validation accepts only `darwin` + `arm64` for `darwin-arm64`; Intel macOS and non-macOS hosts are rejected. - Artifact validation requires a nonempty Darwin `runtime.node`, `copilot`, and matching `platform.properties`. - Local-publication validation requires all three classifiers and rejects native resources from the wrong platform. - Fetch tests cover complete, missing, and stale Darwin staging states. ## Validation coverage - Darwin native-host acceptance and rejection tests. - Darwin classifier artifact-validation tests. - Three-classifier local-publication validation and contamination tests. - Native fetch tests across Linux, Windows, and Darwin classifiers. - Apple Silicon `mvn -Pinprocess clean verify` in the Java CI matrix. - Native publication-input build on `macos-26`. - Complete Linux/Windows/Darwin local publication assembly on Ubuntu.

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[Java] Initial implementation for darwin-arm64 #2400

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