Publish pipeline: goreleaser + Maven Central + npm (#1)

* feat(cli): add Version var and version subcommand

* build(gradle): introduce uatu.version property for lockstep releases

* build(sdk-android): swap GitHub Packages for vanniktech Maven Central plugin

* build(spec-api): make package publish-ready for npm

* ci(release): add goreleaser config for cross-platform uatu CLI builds

* ci: add ci and release GitHub Actions workflows

* ci: restrict ci.yml to PR + workflow_dispatch (no direct push to master)

* docs(release): add local release targets, env example, and install docs

* build(sdk-android): make signAllPublications conditional on signing key

* ci(release): stage sidecar JAR at embed path before go build

* chore(spec-api): regenerate package-lock for updated package.json

* ci: install protoc-gen-go plugins before buf generate

* ci: bump Node to 22 (required for --experimental-strip-types)

README.md

@@ -6,3 +6,46 @@ Testing framework and spec in ts/js used for blackbox testing and property based
 ## Supported Platforms
 - android
 - ios
+
+## Install
+
+### CLI
+
+Download the platform tarball from [GitHub Releases](https://github.com/priyanshujain/uatu/releases/latest):
+
+```sh
+# macOS arm64
+curl -L https://github.com/priyanshujain/uatu/releases/latest/download/uatu_<version>_darwin_arm64.tar.gz | tar xz
+# Linux amd64
+curl -L https://github.com/priyanshujain/uatu/releases/latest/download/uatu_<version>_linux_amd64.tar.gz | tar xz
+
+./uatu version
+```
+
+Pre-built for `darwin/arm64`, `darwin/amd64`, `linux/amd64`, `linux/arm64`.
+
+### Spec API (npm)
+
+```sh
+npm install --save-dev @uatu/spec
+```
+
+```ts
+import { extract, always, actions } from "@uatu/spec";
+```
+
+### Android SDK (Maven Central)
+
+```kotlin
+// settings.gradle.kts
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+    }
+}
+
+// app/build.gradle.kts
+dependencies {
+    implementation("io.github.priyanshujain:sdk-android:<version>")
+}
+```