refactor(core): centralize DSH home resolution

packages/util/home/tests/home.spec.ts

@@ -0,0 +1,26 @@
+import { homedir } from 'node:os'
+import { join, resolve } from 'node:path'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { DSH_HOME_ENV, resolveDshHome } from '@deepseek-ai/dsh-home'
+
+afterEach(() => vi.unstubAllEnvs())
+
+describe('resolveDshHome', () => {
+  it('prefers an explicit configured path and resolves it absolutely', () => {
+    vi.stubEnv(DSH_HOME_ENV, './environment-home')
+
+    expect(resolveDshHome('./configured-home')).toBe(resolve('./configured-home'))
+  })
+
+  it('uses DSH_HOME when no configured path is supplied', () => {
+    vi.stubEnv(DSH_HOME_ENV, './environment-home')
+
+    expect(resolveDshHome()).toBe(resolve('./environment-home'))
+  })
+
+  it('defaults to the .dsh directory under the user home', () => {
+    vi.stubEnv(DSH_HOME_ENV, undefined)
+
+    expect(resolveDshHome()).toBe(join(homedir(), '.dsh'))
+  })
+})