feat(HAI-081): add changesets-based automated versioning and release workflow

- Install and configure @changesets/cli with commit/access settings
- Create version PR workflow (.github/workflows/version.yml) for automated version bumps
- Update existing release and test-release workflows with version validation
- Add example changeset and version tests for CI verification
- Add RELEASING.md guide and update README with versioning documentation

packages/cli/src/__tests__/version.test.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect } from "vitest";
+import { readFileSync, existsSync } from "node:fs";
+import { join } from "node:path";
+
+const repoRoot = join(import.meta.dirname!, "..", "..", "..", "..");
+
+describe("Changeset configuration", () => {
+  it("should have a valid .changeset/config.json", () => {
+    const configPath = join(repoRoot, ".changeset", "config.json");
+    expect(existsSync(configPath)).toBe(true);
+
+    const config = JSON.parse(readFileSync(configPath, "utf-8"));
+    expect(config).toBeDefined();
+    expect(typeof config).toBe("object");
+  });
+
+  it("should have baseBranch set to main", () => {
+    const configPath = join(repoRoot, ".changeset", "config.json");
+    const config = JSON.parse(readFileSync(configPath, "utf-8"));
+    expect(config.baseBranch).toBe("main");
+  });
+
+  it("should have changeset scripts in root package.json", () => {
+    const pkgPath = join(repoRoot, "package.json");
+    const pkg = JSON.parse(readFileSync(pkgPath, "utf-8"));
+
+    expect(pkg.scripts.changeset).toBe("changeset");
+    expect(pkg.scripts.version).toBe("changeset version");
+    expect(pkg.scripts["release:version"]).toBe("changeset version");
+  });
+
+  it("should have .github/workflows/version.yml with expected content", () => {
+    const workflowPath = join(
+      repoRoot,
+      ".github",
+      "workflows",
+      "version.yml",
+    );
+    expect(existsSync(workflowPath)).toBe(true);
+
+    const content = readFileSync(workflowPath, "utf-8");
+    expect(content).toContain("changesets/action");
+    expect(content).toContain("push");
+    expect(content).toContain("main");
+  });
+});